Thought I'd start a thread on this, as it is something I will need to consider over the next few months.

I certainly won't replace with the stock Bridgestones -- I don't reckon they offer the grip … and they are hideously expensive!

I have been a Yokahama fan in the past. On my Mazda Astina hardtop, they offered more grip and were quieter…

What does eveyone else think? :confused:

If you want to keep the stock tire size you might look into Yokohama's AVS ES100's. They are a great tire for the $$
Here's (http://www.tirerack.com/tires/tires.jsp?tireMake=Yokohama&tireModel=AVS+ES100&vehicleSearch=true&partnum=245WR8ES100&fromCompare1=yes) a little about them. I've gone through a couple sets on my Miata and have been very happy with em.

I'm trying to decide between them and Bridgestone's pole position in 235/40/18 (http://www.tirerack.com/tires/tires.jsp?tireMake=Bridgestone&tireModel=Potenza+S-03+Pole+Position&vehicleSearch=true&partnum=34YR8S03PP&fromCompare1=yes). Anyone have these and happy with em? I like the price of the Yokohama's better but may give these a run.

the stock tyre size seems a little small for the standard rim? has mazda chosen this due to cost and looks?

Originally posted by timbo
I certainly won't replace with the stock Bridgestones -- I don't reckon they offer the grip … and they are hideously expensive!


My tyre guy told me that the standard Bridgestones are bloody expensive because they're the original tyres Mazda put on the 8 and therefore they incur a genuine replacement part price mark up.
Talk about price fixing schemes!

When it comes time to replace my tyres, I'll be going with Falkens due to their soft compound (greater grip) and cheaper price (so I can replace them as often as I like due to the softer compound) :)

I used to put Toyo's on my rides. Found them to have a good compromise between wet and dry use, and were a reasonable price, however, on the recent set they seem to be a more greasy tyre and grip has suffered as opposed to the previous Toyo's.

AMG,

You should make a note of the country of origin next time you find a tyre you are happy with.

Even though you can have two tyres from the same make and model, they may differ from each other due to their country of origin.

From my experience, Goodyear F1's made in Germany are a excellent tyre, whereas the same tyre made in Thailand suck monumentally.

wouldn't tyres that suck provide more grip ???????

Not literally unfortunately.
The second set made in Thailand was a utter waste of money and I've been very wary since.

so has anyone tried a 235? thats the logical size for 8" rims the 225's are a bit of a stretch and surly wouldn't do any good for sidewall stiffness.

Good point - the SS had 235's on an 8" rim.

What about a 245/40 in a P Zero Asimmetrico?

To me these are looking like a good replacement tire, getting the best reviews at the Tire Rack. Description:

"The Michelin Pilot Sport PS2 Max Performance "summer" tire was initially developed for use as original equipment on some of the world's most prestigious sports cars and sports sedans by combining world-class wet and dry handling with confident and predictable cornering. Some of the first fitments include the BMW Alpina Z8, Chrysler Crossfire, McLaren SLR and Porsche GT2 & GT3 models."

The sizes are limited til summer 04, so for now the best match is 235/40YR18 (2.2% fast speedo error). Anyone already tried these?

Bridgestones SO3 Pole Position is a good all rounder, with excellent wet and dry grip and also surprisingly low road noise. I was very happy with them on my Bimmer - in fact it's the only high performance tyre I have EVER bought 2 sets of. Their only drawback - sidewalls are just a bit too flexy IMHO. That dulled the steering turn in response on the Bimmer a notch - easily overcome by an extra 2 psi or so.


Falkens always seem to be rated as good value, but I've heard some complain of poor road noise.

I had a good run with a set of Toyos Proxes T1-s a while back too. Very similar performance to the SO3's.

If you haven't alreday checked it out, the US site www.tirerack.com has lots of tests and user reviews that might be helpful.
:)

Originally posted by rotarenvy
so has anyone tried a 235? thats the logical size for 8" rims the 225's are a bit of a stretch and surly wouldn't do any good for sidewall stiffness.

I'm tempted to go to a 235, or maybe even 245. But there are a couple of issues.

First, the extra width is good, as is any additional sidewall to prevent the traumatic wheel scuffs many of us experienced in the first couple of weeks of ownership (well ok, "us" is a gross generalisation but it happened to me;) ) Equally, don't want to damage those sidewalls, though :(

But secondly, what will the impact be of dropping down a profile size (from 45 to 40)?

2.2% 'optimism' on the speedo (which is already between 2 & 5% optimistic)? -- Help me with my maths here, but that suggests going to a 245/40 would *just* about correct this error :confused:

Likely additional harshness and coarse surface road noise? (I must say I find coarse surface road noise the greatest weakness of all Mazda cars)

Will 245s work on the front wheels?

Tyres are expensive decision, especially as this will be a full set change. I also wonder if there are compound differences between North America/Europe and Australian needs?

Has anybody else noticed that the RX8 has Bridgestone SO3's fitted on it in the RX8 brochure?

It appears on the fifth page with the side on profile shot of the 8 spread across two pages.

Did we get the short end of the stick again?

Originally posted by timbo
But secondly, what will the impact be of dropping down a profile size (from 45 to 40)?


A 235/40 will have a diameter 10 to 15mm smaller than the 225/45....'twill look a tad puny in the wheel arch....

Maybe a good time to invest in a set of adjustable height coilovers as well, Timbo.

Gomez

I think you have to go to 245/40.

Anyway someone did suggest Michellin Pilot Sport. They are like slicks man! Chrysler Crossfire has those. $2.5K to replace 4!

Remeber or read about GT3 vs M3 CSL? The CSL is 1 sec quicker because of the tyre - and the GT3 has Michellin Pilot (non-sport)

Originally posted by nojooc
Has anybody else noticed that the RX8 has Bridgestone SO3's fitted on it in the RX8 brochure?

It appears on the fifth page with the side on profile shot of the 8 spread across two pages.

Did we get the short end of the stick again?

How did you spot that nojooc.. I think we can hold a class action against Mazda :p

Nah, there's a disclaimer inside the back cover stating that Mazda has the right to vary or change specs at any time.

damn....

I raised this with mazda and the response is that only the re040's will be supplied. Initial early reviews of the rx8 from wheels had the s03's listed in the specs, so they must have changed it somewhere along the line. I think it might be because we have bad roads in australia and the re040 has better ride quality as it is listed as a touring tyre on the bridgestone website. I think the michelin pilot sports will be good though, they shoudl be around the same price as the bridgestones?

fatmarco

Originally posted by takahashi
I think you have to go to 245/40.

Anyway someone did suggest Michellin Pilot Sport. They are like slicks man! Chrysler Crossfire has those. $2.5K to replace 4!

Remeber or read about GT3 vs M3 CSL? The CSL is 1 sec quicker because of the tyre - and the GT3 has Michellin Pilot (non-sport)

Actually the M3 CSL wears the Michelin Pilot Sport Cups (semi-slicks DOT R compounds) which are even grippier than the standard Michelin Pilot Sports, which is fitted on the GT3.

If you are intending on using the car only for daily road use and some spirited driving in the mountains then S03, Eagle F1 GSD3, SP9000, or T1-S will be at the top of the list. Michelin Pilot Sports are notoriously expensive and up there with Conti Sports and P Zeros.

Hey Blackie, good post....Welcome aboard old son...

Gomez

Both the f1 and the t1-s are pretty average tyres these days. Both were great tyres that are now victims of poor manufacturing quality. The T1-S suffers from sloppy sidewalls, but does have excellent straightline traction.

-pete

Hi there. Yeah I've just started to visit this site a bit more often so I thought I'd register and post. I just got new tyres for my car and had done a fair bit of research on tyres so I thought I'd chime in as well.

I've always liked the RX-8 since its concept. I've even got an RX-EVOLV full brimmed hat from Mazda :)

Well the Eagle F1s have always been touted as one of the best high performance tyres and are famous for having great wet weather traction, although some of the latest tyres these days seem to pip it for ultimate road holding.

I had Toyo T1-S back when I had my '01 MX-5 and they were great for the $$$. The sidewall I must admit felt a bit softer but running a higher pressure compensated for that. The tread was also quite durable.

My friend's RX-8 wearing the OEM rubber seemed to stand up well after a day at DECA last weekend. My OEM S-02s on my S2000 however where absolutely shot. Orange peels on the edges, feathering and blistering from the centre out. These tyres were of a softer compound though and they were nearing the end of their life anyway. I think the harsh gravel of the double figure 8 loop at DECA saw the end of them ultimately. I have put on new Toyo RA-1s now.

Blackie where about in Melbourne are you... I am also having a black RX8

Sport Cup.... ic... it is still street legal. Do you know how much it is ??

Guys, have a look at the Yokohama A539.

I have them on my 323 as well as my VX SS.

The stock Bridgestone 530 SS tyres are very similar to the Bridgestone 040s and I found the A539 a big improvement in grip, wear and noise.

I got 33,000kms out of the 530s and am now up to 32,000kms on the A539s and they look to have at least another 10,000kms in them.

I live a couple of minutes from the city. I don't actually have an RX-8 and my car's white.... my friend has an RX-8 that's black however, if that validates my username :)

Pilot Sport Cups are street legal although I don't know how they are on the street. R compounds are usually very noisy and harder to turn the wheel at street speeds. The RX-8 being the relatively quiet car it is already, you will really notice the droning noise these tyres will have on the highway.

They also wear a lot faster than the normal high performance tyres due to their softer compound and if the tread is worn a little then I'd be very wary of any standing water. I got a quote for my sizes and they were $1800+. For the RX-8 on your 18" rims I would imagine well over $2500 for the set, plus they would probably only last 7000km-20000km before they need replacing (depending on how hard you drive and how many track days you do).

Originally posted by Blackie
I had Toyo T1-S back when I had my '01 MX-5 and they were great for the $$$. The sidewall I must admit felt a bit softer but running a higher pressure compensated for that. The tread was also quite durable.

I've tried playing with the pressure (around 41psi at the moment) but still no luck. You're right they're a tough tyre, I'm going back to QR this weekend to try and kill them so I can get something else, but they always seem to survive. They do seem to overheat pretty quickly on the track, but hey that's QLD for you.

-pete

Yes they certainly are tough aren't they? :) They did start overheating and generally squirming their tits off after a couple of hot laps but that's a compromise that most street performance tyres have to put up with. I usually ran them at 38psi cold for the track and I wasn't too concerned with the softer sidewall. It was a compromise between track and street after all. I still don't understand how hard it is to make a road flat in this country.

Guys

This is becoming a most informative post.

I was thinking about Yokohama A539's, which I have used before with good results. But, should I go 245/40 -- I think that will keep me close to the same diameter and rolling size as 225/45s?

I do too many highway Ks to go for the softer R compound

You will only be slightly lower in sidewall height, but bear in mind your speedo will be reading just a tad faster than normal but nothing too drastic. Check this link to calculate your tyre/wheel size changes. http://www.miata.net/garage/tirecalc

http://www.richardm.planet.net.au/Richard/Graphics/LS1/Tyre%20size.jpg
From this tyre size calculator. (http://www.powerdog.com/tiresize.cgi)
I'm happy with the A539 and will buy again.

Originally posted by rpm_pwr
Both the f1 and the t1-s are pretty average tyres these days. Both were great tyres that are now victims of poor manufacturing quality. The T1-S suffers from sloppy sidewalls, but does have excellent straightline traction.

-pete

Some moons ago I had the Eagle F1's on my VR6 Golf. They were noticeably inferior in every respect to the Proxes T1-s and more so to the Bridgestone SO2's I also ran on that vehicle. I think the F1 has however been redesigned a year or two ago - maybe it's a better bet now.

One nice thing about the SO2 and SO3 is that they don't seem to drastically lose wet grip as they wear. I guess the dual tread compound must be something to do with it.

Thanks Richard

That's a great site. I guess the next issue in moving to 245's is guard clearance

BTW, the 8 has 18" rims ;)

Edit: Just looked at the Miata site Blackie recommended -- shows width relative to stock -- 245s should be fine.

Tim

I've always been happy with the Toyo Proxes. Nice and soft and sticky. Wear isn't fantastic, but there is always a trade off.

They do a 225/40ZR18 92WRD in the Proxes T1-S. These ones are great for aquaplaning protection and high speed stability. Great value, but prone to touch of tramlining - but probably no more than the OEM Potenzas. Maybe a little over $300 each if you shop around.

The other I might consider is the Toyo RA1, but I probably don't need competition spec racing tyres - and I don't need to pay $450+ a tyre.

Originally posted by timbo
Thanks Richard
BTW, the 8 has 18" rims ;) And your point is? :D

Dsylexia relus, ko, but I thought the chart above had 17s :eek:

Just looked at the Yokohama site and discovered the A539 doesn't come in 18". Back to drawing board

Originally posted by timbo
Dsylexia relus, ko, but I thought the chart above had 17s :eek: It did. I edited the web page.

Bummer about no 18" A539 though. :(

What is the URL for the Aus Yokohama site? I've been unable to find one.
Check with a dealer re 18". Web sites can be very out of date.

I thought you did -- then decided my eyes were playing tricks on me ;)

http://www.yokohama.com.au

yes, I did think it may be out of date, so may check with a dealer over the weekend

Why would you change to your stock tyre to another similar range and performance for roughly the same price - if there is no siginificant improvement it is just a waste of money.

Therefore I will change it to either P Zero or Michellin Cup Sport... or just keep the Potenzas. In my opinion it is silly to change to 4 Toyo if the rear wears out.

I'm sorry, one stupid question for me~:p

as everyone saying that change it to a 245/40 tyres, do we acutually have to change the rims as well? Since the tyre is wider than the stock.:(

No I think we can easily get away with 245 in a 8 inch wide rim. I checked with the tyre guy... someone punch in the computer to see how much difference (if at all) b/n 225/45 and 245/40?

If you want your insurance to stay valid, a wheel change may be req'd!!

The Tyrepower I went to yesterday (fitted a pair of P6's onto the Pug) said that 245's on an 8in rim were ill eagle....

There's a spanner....

Gomez

There are plenty of people in the US using 245/40/18s. An 8-inch rim is more than sufficient for a 245. Illegal? I find that hard to believe. Here's some pics of 245s on an 8...

http://www.rx8club.com/showthread.php?s=&threadid=18621&highlight=245%2F40%2F18

It's a local thing RD, there is a maximum allowable percentage increase in width over whats shown fitted as std on the tyre placard....not sure what the limit is though....some-one here will know...

Gomez

Ah, I see.

It's a rule that simply maintains that a replacement tire be XX-% within size of the original.

Sigh... burueacrats...

;)

My point was merely that an 8-inch wheel is more than sufficient width-wise for a 245. Purely from a technical standpoint. ;)

Oh! :( I'll check it out with my dealer

From the Yoko website:

http://www.richardm.planet.net.au/Richard/Graphics/ls1/tyre%20rim%20size.jpg

You can fit 245/40s to the standard 18" wheels. All of this is governed by ADR 24, which basically says you must ensure that the load carrying capacity and speed rating of the tyres are at least equal to, if not better than, the sizes shown on the vehicles ADR24 tyre specification placard.

Full, boring details follow: ;)

Provided this is the case, then:
- fitting of replacement wheels (and suitable tyres) up to 26mm greater than the widest optional wheel offered by the vehicle manufacturer for that vehicle. The replacement wheels must meet the general requirements and must not increase the wheel track by more than 25mm when the original axle components for the vehicle are retained;
- The overall diameter of the alternative wheel and tyre must not be greater than 15mm over the largest diameter wheel and tyre specified for the vehicle and shall not be more than 15mm below the smallest diameter wheel and tyre specified for the vehicle.
- the rim width must not be less than the minimum width fitted by the vehicle manufacturer for the_ particular model,
- the wheel (and tyre) must be contained within the body work, or mudguards, which includes “flares” when the wheels are in the straight ahead position;
- wheels (and tyres) must not foul any part of the body or suspension under all operating conditions;
- the wheel and tyre combination must be in accordance with the tyre and rim standards published by the “Tyre and Rim Association of Australia”:
- the wheel must be one designed for the particular hub/axle in respect to both pitch circle diameter and wheel nut tapers. Wheels with slotted stud holes are not permitted:
- where the original axle components for the vehicle are retained, the wheel track must not be increased by more than 25mm beyond the maximum specified by the vehicle manufacturer for the particular model. Where non original axle or suspension crossmember components are fitted, the offset of the wheel in relation to the axle or stub axle assembly used shall not be increased by more than 12.5mm each side of the vehicle based on the specifications of the axle components used. If an axle assembly is shortened then the track limit is taken as the axle manufacturers original track dimension, less the amount the assembly has been narrowed, plus 25mm.
- All rims fitted to “an axle” must be of the same diameter, offset, width and mounting configuration (except for spare wheels used in an emergency situation);
- The wheel must not prevent the wheel nuts from fully engaging their studs;
- The rim must not have a circumferential weld other than that which attaches the rim to the wheel centre;
- Speedometer accuracy must be maintained for the selected tyre and rim combination to within the degree of accuracy specified in ADR 18/01 (+/- 10%);
- The fitment of wheel spacers (or adaptors for dual wheel conversions) between the wheel mounting face and the road wheel is not permitted unless fitted as original equipment by the vehicle manufacturer.


Damn -- I was thinking about dual rear wheels for the 8! :D

the stock 225's are a bit small for the 8" rim 235 is about right and 245 is a bit big for 8". all sizes will fit the rim but you might start to get more flex in your side walls with something they have to strech on or squeeze on. I reckon with a 245 on a 8" rim you will have the contact patch moving round in relation to the rim detracting from the handeling.

Hey the stupid Bob Jane I went to locally said in the size 225/45 only have RE040, Michellin Pilot Sport or PZero Rosso. More choice in 245/40 and the circum is 6mm diff...

Originally posted by RichardM
From the Yoko website:

http://www.richardm.planet.net.au/Richard/Graphics/ls1/tyre%20rim%20size.jpg

Sorry Richard -- was that indicating that A539s are now available in 18", or that 245s will work on an 8" rim?

Timbo, check with your insurer b4 laying down any folding...

Gomez.

Originally posted by takahashi
Hey the stupid Bob Jane I went to locally said in the size 225/45 only have RE040, Michellin Pilot Sport or PZero Rosso. More choice in 245/40 and the circum is 6mm diff...

Taka, you're right, 225/45-18 is an oddball size and as a result is relatively expensive....

Originally posted by Gomez
Timbo, check with your insurer b4 laying down any folding...

Sure will, but as I read the ADR, 245s are ok. Have you seen something that says they're not?! :confused:

Originally posted by timbo
Sure will, but as I read the ADR, 245s are ok. Have you seen something that says they're not?! :confused:

No Timbo, just the Tyrepower info....But I've had insurers refuse to insure on the basis of tyre width before...even tyres of std fitment!!

Maybe its a Victorian roadworthy requirement that they were referring to.....

Gomez.

Oh yes, roadworthiness is an entirely separate issue, where State laws come into play…! :eek:

Originally posted by timbo
Sorry Richard -- was that indicating that A539s are now available in 18", or that 245s will work on an 8" rim? Sorry timbo, it was that 245s work on 8" to 9.5"

I am just updating this 'cos I obtained a few prices over the last week. These are 'inquiry' prices rather than those one might when haggling with a full set purchase in the offing.

First, both Bob Jane and Jax say 245/40s are ok on the 18x8JJ standard Aus rim (at least in the ACT)

Secondly, there's not much choice at present in the standard size -- 225/45 -- and they are expensive:
* replacement Bridgestone $475/tyre
* Pirelli $620
* Michelin $625

There's more choice in 235/40 but the circumference is only just within tolerance -- the speedo will be almost 10% optimistic, reducing the final drive and the rate at which Ks are clocked up.

I am quite keen on Yokohama tyres -- as noted above, you can't get A539s in 18" rim, so the selection is S306 -- on par with the standard Bridgestones; ES100 -- probably closest to the A539; and V102 -- best high performance/grip, but they wear quite fast

Prices 235/40 245/40
S306 $390 $410
ES100 $415 $465
V102 $440 $530

As we will all be facing this issue sometime, I wonder if we might create a 'sticky' with tyre prices so we can see where the best deals might be obtained. Don't need to stick to the above, just prices/observations.

Finally, at 25,000K, I reckon I have maybe 15-20,000K more life in my tyres.

I can hear my credit card groaning at these prices ... I may stick a print of this thread under the sunvisor to correct my 'give it a foot full' habits!

a new set of rubber equates to 4% of the purchase price ...

Memo to my career - time to consider working for Michelin!!!

if tyres are 4% of the cost, it makes you realise what a performance bargan you are getting in the rest of the car :D

IF I got 40 - 45k out of a set I would pretty happy. But the price of the new tyres! Ouch!

With the numbers of these sizes of tyres (i.e. 18") increasing (all the SS Commodores are now 18's, I would hope the prices come down some...

Cheers,
Hymee.

I reckon 40K is going to be tops, especially after Wakefield :). It will be a handful in the wet after that.

Yes, that's one thing the tyre guys did say -- more 18" would be coming. And I reckon there is probably 10-15% discount available for a set price

Had to replace two P6000's on the XSI for the roadworthy:( , only got 35K out of them, so would be very happy with 40K on the 8.

Gomez.

I got 25k out of the 17" SO2's on the VT1 Clubby :(

Originally posted by Hymee
I got 25k out of the 17" SO2's on the VT1 Clubby :(

hoon

Ahh - but the B510's on the SS were on there way to 40k :)

VT1 = 195kW
SS = 300+ kW

Cheers,
Hymee.

Mrs Hymee's SS..!

I got just on 50k km on the sti.
Dreadful indictment of creeping old age.

At 15k, I would have about 6-7k left on the rear tyres. I am prone to losing traction occasionally, however.

does this make me more or less on the tyre wear than the average?

Originally posted by dbb
At 15k, I would have about 6-7k left on the rear tyres. I am prone to losing traction occasionally, however.

does this make me more or less on the tyre wear than the average?

I'd reckon that's somewhat lower than average, on the original spec tyres ;) BTW, isn't your dealer rotating your tyres each service? Mine is, consequently wear is pretty even

Hymee,

How about making this a sticky?

Could be very useful as reference when we need to get new tyres.

TIMBO

This thread is definetely one of your best and should be made into a sticky (hint hint ).

I have also been doing my tyre shopping so far i believe the :


TOYOS
TRANPATH SW 235/40R18 AT $ 245 .OO EACH SEEM TO BE THE BEST VALUE PER DOLLAR PERFORMANCE FOR EVERIDAY USAGE .

Any one source these tyres , or has considered these ???

cheers
michael

Michael

I've made a commitment to Hymee to put together all the information on this threaqd to form the basis for a sticky. I've just got to find time to do it.

Tyre replacement will be the next big issue we all face (unless you are of the "oh, gosh the ash tray is full -- time to sell" type owner)

My OE 040's lasted 12k miles. they look like slicks - totally bald.

No mention yet of BFG g-force tires. Do they suck? My inclination is to go with the Pilots based on many recomendations. I do like the 245/40 size.

I just ordered (4) 245/40YR18 Michelin Pilot Sport PS2's - $1,150 installed w/o road hazard. The most expensive tires I have ever purchased.

Originally posted by dbb
At 15k, I would have about 6-7k left on the rear tyres. I am prone to losing traction occasionally, however.

does this make me more or less on the tyre wear than the average?

My guess is that most people would get a bit more. However, you are probably bang on what the tyre is apparently rated to do.

Two weeks ago I had to buy a new Bridgestone (after only 3,000kms - ouch!) because a sidewall got ripped by some metal on the road.

The tyre fitter told me that they were only rated to do 22,000kms. (Softish compound I suppose). Apparently they had a guy whingeing that he'd only got 28,000, so they checked and told him he was doing well!! :)

Not sure where this 'rating' comes from, or how accurate the info was, but I'll remember not to whinge when I wear this set out. ;)

They also told me that the list price (then) was $460, but they fitted and balanced it for $410. The $410 was offered without my asking too, which was welcome as I'm not the world's best haggler.

It was also listed in their books as the stock tyre for the Nissan 350z, plus some Holdens are now using them.

The general opinion was that the increasing demand from these 3 sources - all recent - would mean more choice of brands would start flowing through over the next year. And more brands = more competition = better prices.

Originally posted by BVD
They also told me that the list price (then) was $460, but they fitted and balanced it for $410.

It was also listed in their books as the stock tyre for the Nissan 350z, plus some Holdens are now using them.

The general opinion was that the increasing demand from these 3 sources - all recent - would mean more choice of brands would start flowing through over the next year. And more brands = more competition = better prices.

$410 -- that's a good price. Reminds me I have to do some work...

I think the Potenzas are actually less soft than the Toyo Proxes that I used to have on my Celica. I uses to go through a set of front tyres in as little as 12,000. But then again, the Celica uses to spin the front tyres way to easily. The RX8 only spins the rears when I want it to.

Actually, I think I might go with Proxes when I get the RX8 tyres replaced soon.

They do a 225/40ZR18WRD in their T1-S Ultra Performance range.

Originally posted by 1stRX8
My OE 040's lasted 12k miles. they look like slicks - totally bald.

No mention yet of BFG g-force tires. Do they suck? My inclination is to go with the Pilots based on many recomendations. I do like the 245/40 size.

I just ordered (4) 245/40YR18 Michelin Pilot Sport PS2's - $1,150 installed w/o road hazard. The most expensive tires I have ever purchased. my bald tires (http://www.rx8club.com/showthread.php?s=&threadid=30529)

So now we have 2 types of overinflation - DjGO's tyres, and some of those priced :)

Originally posted by Hymee
So now we have 2 types of overinflation - DjGO's tyres, and some of those priced :)

lol i feel so special thanks everyone for this prestigious award :D

So when do I get a medal or a throphie................waiting..............still waiting..................OK guess IM not getting one!

this one should be sticky!

has anyone changed there tires yet?
any know if the stock 225/45/18 can be streched on to a 8.5" rim?

has anyone stagered their tyre sizes in oz yet?

AFIK, a limiting parameter on tyre size replacement is the effect on speedometer reading by choosing non-standard tires. The American tirerack.com site lists the "revs per mile" for the following possible tyre sizes:

225/45-18 = 804 rpm
245/40-18 (michelin Pilot Sport PS2) = 809 rpm

(which is a pretty close match)

L&L, can you quote the revs per mile (or km) for the Toyos you've been quoted? The retailer should have these specs

The michelins are around 1/2% out, or less than 1 km/h at 100 km/h

The best size is actually 255/40 R18 .... it is just a bit out. Then again ... is there any choice of tyres?

255 will need 8.5 or wider rims. 245 will be the biggest fit to the stock wheel

well I'm tempted to go to 9" all around but thats some mighty wide tyres on the front. stagering the sizes dosn't seem worth the effort and loss of economy.
I'm tempted also to go to 19" but the tyre choise drops and I have heard that the performance of 19" tyres isn't as good. there isn't many R rated tyres in 19" :(

Following from L&L's post regarding the quote he received from a Toyo dealer for Tranpath 235/40R18's, I thought to contact Toyo Australia direct for some expert advice. I received a most comprehensive answer, and I post it here in the hope that it proves helpful to forum members.

"Thanks for your enquiry Labrat .
You can fit the 235/40R18 size to your RX8.
The 235/40R18 size will fit well on the O.E. wheels, which are are 8" wide.
The difference in overall diameter of the 225/45R18 and the 235/40R18 will be = or < 2.3%.
Therefore where the speedo read 100kph, it will now read 102.3kph.
This change is well within the guidelines specified by the Queensland Transport Regulations for alternative wheels & tyres.

Most importantly, the O.E. tyre size for the RX8 has a load rating of 91. The 3 Toyo patterns available in the 235/40R18 size have a minimum load rating of 91. When changing tyre sizes, it is essential that the load rating for the alternative tyres is at least equal to the minimum load rating required, as stated on the tyre placard. Keep in mind that the minimum load rating stated on the tyre placard is often lower than that of the O.E. tyre size. This load rating requirement applies in all states.

Toyo has 3 patterns available in the 235/40R18 size. It is generally fair to say that the more grip tyres offer, the shorter the tread life.

1. Tranpath SW. This is a non-directional pattern that provides long tread life, low tread noise & very good ride comfort for a 40 profile tyre. The Tranpath SW would provide longer tread life compared to your Bridgestone RE 040, but lower levels of grip.

2. Trampio Gu:wn - TPG. This is a directional tyre that is more performance oriented compared to the Tranpath SW. The TPG has higher grip levels compared to the Tranpath SW, with a sharper steering response but a slightly harsher ride. The TPG has a very good wear rate for a high performance tyre, but faster than the Tranpath SW. On most vehicles the TPG has slightly increased noise levels compared to the Tranpath SW.

3. Proxes T1-S - this is Toyo's ultra-high performance tyre. Compared to the TPG it has slightly higher grip levels, a faster steering response, a faster wear rate & a little more tread noise on most vehicles. The Proxes T1-S has a directional tread pattern.

Attached are product information sheets for the 3 patterns mentioned above.
I would recommend the TPG for the RX8, as its performance characteristics suit the sporty nature of the RX8 while still providing a good wear rate & ride comfort.

I hope this is helpful.
Regards,
Steve Burke,
Tyre Technical Dept. "

If anyone wants copies of the .PDF spec. sheets thay can pm me direct. Please tell me on this forum if you have, as I don't check there very often. I tried to upload the files but it took too long.

I have BF goodridge G-Force KDW2 245/40 18. Thease tires are the best tire's i have ever bought. I had toyo T1s they were ok but nothing compared to the Kdws i already have 1,500 miles and there is not much wear. I have been burning out, drifting, auto crossing and beating the crap out of thease tires and they just want more. Did i also say the sick a$$ thread design it looks pretty cool. After thease babys wear down i will order more of them. :D

Labrat

Great follow up, is there any mention of price for the TPG , MAYBE A FORUM GROUP BUY COULD BE ORGANISED IF THERE IS ENOUGH INTEREST .
;)
cheers
michael

L&L: No, I didn't ask about price, since Toyo Australia would probably only quote RRP, rather than any discount price than a dealer might offer. However, I did a bit more reading on the Toyo specs., and wrote Steve Burke a follow-up note:

Sorry to disturb you again, but on reading the attachments that came with your email more carefully, I note that the TPG tyre range has a 245/40ZR18 97W. This is also approved for 8” wheels, has a higher load rating and does 502 revs/km (compared to the O.E. 225/45-18’s, which are 500 revs/km). Would this size be a better choice than a 235/40ZR18 91W?

He replied:

You are correct !
The 245/40R18 is a little closer in overall diameter compared to the 225/45R18 O.E. Size. The difference in overall diameter is less than 1%.The 245/40R18 would be a better alternative. The 245/40R18 is becoming a common size.
Toyo also has street-legal race tyres for users that want to do super sprints or club days. The only size we have available in street-legal race tyres that would be suitable for the RX8 would be 225/40R18.

At least I'm improving my knowledge of this matter! The comment that the 245/40R18 is becoming a common size might auger well for pricing.

Labrat

I will price the245/40 ZR 18s tommorow from memory i was told about their availability / suitability , however the price hike over the 235/40ZR18s was quite substantial. ;)

I was quoted $245.00 for the 235/40 ZR 18s , i will check what the price difference is between the two sizes .

cheers
michael

Labrat

Ok i priced the toyos .

The 235 /40 ZR 18s
TRANPATH SW =$245.00

Trampio TPG =$329.00 however they are available on a cleareance run for $ 295 .00 at the moment .

Proxes TI-S =$395.00

Going up to the Proxes T I-S ON the 245 /40 ZR 18s the price is $453.00 .

As you can see there is a considerable difference to the price between the sizes and type of tyre treads .

The big question is what is the correct type tyre for your daily type of driving , as opposed to buying the tyre for the performance and wank value factor .

I s the difference between the 235/ 40 zr 18s SW TRANPATH AT $ 245.00 / OR THE Proxes T 1 S 245 / 40 zr 18S at $ 453.00 worth it .( $208.00 difference )

cheers
michael

L&L, from what little I have gleaned, it appears that the Trampio TPG is probably the best replacement for the RE040 with regard to matching performance and other qualities. You are right that for the average punter like myself, the TRANPATH would be the right tyre. Frankly, I probably wouldn't be able to tell the difference, and the ability to rotate tyres at will with the longer tread life and quieter running might be qualities I might take into account. However, the 2% speedo error of the 235/40 might be something to think about. I had the opportunity earlier this year to calibrate my speedo against the Victorian road units (twice), and I found that my car is already reading 2% high. That is, at an indicated 100km/h, I was actually doing 98 km/h. Add another 2% error on that, at an indicated 100km/h I would only be doing 96km/h actual. That might give some people pause to think, because it is getting into kind of a grey area. Having to put 4% onto your cruise control for highway speed limit motoring could put you at risk to being ticketed.

Now that it seems that the 245/40R18 is probably the best compromise for the 225/45 R18, it would be interesting to see what is available in other brands in this "more common" size. For instance, what's available in Dunlop, Yokohama, etc?

;) 245/40ZR18S NEED a 8.5 " wheel ???

I will check out some other brands as well , if i have to spend $400.00 + i better do my homework .

cheers
michael

245 is ok in the 8"

Toyo is a good tyre but T1-s wear out quick though - I rather go for Potenza S03 PP

go to www.tirerack.com and check out the rating - but Toyo is not in though.

If you check the Toyo spec. sheets, you'll see that both 235/40 and 245/40 are suitable for 8 - 9.5" wheels.

Unlike Taka, I'm going to compromise outright handling with other more mundane factors, so I'll be shopping very carefully indeed.

hmmmm... I use my RX-8 as a weekend car --- if I drive it daily it will be a differnet choice - you are right labrat

Just checked out www.1010tires.com.

Toyo
Proxes T1S : Overall 4.1 / 5. Dry Traction : 4.8. Treadwear 3.7.
Proxes FZ4 : Overall 3.8/5. Dry Traction 4.2. Treadwear 3.7.

BFGoodrich G-Force KDWS : Overall 4/5. Dry Traction 4.5. Treadwear 3.2.

Michelin Pilot Sport PS2 : Overall 4.8/5. Dry Traction 5. Treadwear 4.4.

It is a pity the Michelins cost so much ...

Good info dbb

I think Toyo is a bit underrated in that though... I think they worth more than 4.1 if Pilot Sport get 4.8 (or if I mistaken PS2 is the "cup" version in Australia ~ i.e. semislick?)

I had the opportunity earlier this year to calibrate my speedo against the Victorian road units (twice), and I found that my car is already reading 2% high...

Ooooh, just spotted this......don't rely on the overhead speed check gantrys in Victoria to be accurate. They are notoriously innaccurate at times. The best (cheapest) way to accurately check your speedo remains the tried and true timed run over a marked kilometre. I reckon the digital jobbie in the 8 is pretty good actually......

Regards, Gomez.

How about the GPS system that calculate the speed - any less of the error there!?

I agree with Gomez though, old method is a good method. :o

Ooooh, just spotted this......don't rely on the overhead speed check gantrys in Victoria to be accurate. They are notoriously innaccurate at times. The best (cheapest) way to accurately check your speedo remains the tried and true timed run over a marked kilometre. I reckon the digital jobbie in the 8 is pretty good actually......

Regards, Gomez.

Because I must be an anally retentive sort of guy :rolleyes:, and keep driving back and forth between Canberra and Sydney, I do the marked 5K tests a lot, and consistently find my speedo reads about 5% high :o

Because I must be an anally retentive sort of guy :rolleyes:, and keep driving back and forth between Canberra and Sydney, I do the marked 5K tests a lot, and consistently find my speedo reads about 5% high :o

Timbo

This is Mazda way of making us feel that we actually driving a faster car , I HAVE ALWAYS FELT THAT THE SPEEDO IS NOT VERY ACCURATE , very much on the high side .
5% SHAME MAZDA SHAME . :mad:

cheers
michael

you reckon it's that bad? when I'm on the highway with it set to 100km/h I seem to be at the same speed as other cars. at 5% ie 5km/h you would get overtaken by everyone very quickly.

Actually, I must correct myself. The odometer reads 5% high. Whether that translates to the speedo is another issue.

But, reading most car tests these days, which use Correvit timing gear, a 5% error seems about the norm

I was doing a search for tire sizing, and inside one of those I was linked to this thread...I was wondering why everyone posting was from Aus, until I saw what forum I was in :D Guess I'm out of my turf.

But if you wouldn't mind, I wanted to ask a question. I read through the entire thread, and saw no information on 19" wheels. I did want to go 19", but the tire selection seems to be limited.

What I feel to be my best bet are Falken GR Beta FK-451, in 235/35ZR-19. What would be the pros/cons of these kinds of tires? I also plan to lower the car ~1" with a MS suspension, so I want to minimize rubbing. However, I also don't want to be riding on a super-low profile tire.

Thanks for any input.

EDIT: Oh, and if any of this looks like I don't know what I'm talking about, that is absolutely correct.

Everything is relative, as they say :p

AFAIK, 19" means you must go for a fairly low profile tyre to avoid fouling. A 235/35 has a sidewall size of 87mm compared to the stock 225/45 - 18 tyre sidewall of 101mm. That means it's 14% 'thinner' if that is your concern re lower profile, with all the additional harshness that implies. If you also lower the suspension, I don't think you can expect any compensating benefit :rolleyes:

It's not something I'd do, especially if I had any comfort concerns.

the limited tyre range is one reason I'm not going 19".
other reasons; the lower side wall height reduces ride quality, rough road handling; while you can find light weigh 19" wheels, a light 19" weighs more than a light weight 18".
19" look good tho :(

Anyone in Aus replaced the stockers after wearing them out? Did a call around today, here's the results in CBR... will go to Syd if prices are worth it and I can get it done in a few hours while I'm there.

Bridgestone RE040 : $420 - $510
Bridgestone GIII : $340 - $374
Michelin Pilot Sport : $535 - $685
Falken ZE512 : $452 - $600
Pirelli ZeroRossi : $530

These are all the stock size, got various quotes on 245/40R18s, but keen to stick to the stock size... had more than one place say "are you sitting down?" when they came back with the prices, many of them said it's a very uncommon size and would be very very pricey...

Advice anyone? Need to purchase in the next few weeks (on the wear bars already)

Anyone heard anything about the Bridgestone G3s (GIII) ? Apparently they're new here, hard to find much info.

Oh, and if you look at the Bridgestone Aus website, unless you put in the RX-8, they don't list the RE040 as available anymore, calling them direct today, apparently they only have 4 left in the country (not kidding you, enough for one car!)

pepe

I have found the same thing (and yes, I know I was supposed to compile a sticky on this, but it is quite depressing). Might check out Sydney prices next time I am there.

And there are other problems: two weeks ago I was told there are no Bridgestone RE040s in the country and it was not known when they were due. A bit of a problem if you rip one tyre. :eek:

I'd add to your list

Yokohama V102 $460
Yokohama V141 $530
Yokohama ES100 $410 (on a par with the 040s)

There is more choice in 245/40-18, they are legal and I have a verbal ok from my insurer, but I'm unsure if they might not foul at the front.

What about 225/45s on the fron and 245/40s on the rear .... or is that possibly a bit naff?? :confused:

Perhaps we could try a bulk buy, at least in Canberra -- 8 tyres not being very 'bulk'

How about the Potenza S03s.. I think they are in 245/40-18 only..

I will go to 245/40-18. They might be cheaper than you think coz the HSVs and now the FPVs are in this size

When i punctured my tire i had a temp tyre which was fitted. The size is at 225/40 which is fitted on the rear left side. so i have 3 tyres in at 225/45 and 1 at 225/40. I need to do a wheel alignment and balance but do you guys think it will be ok for the time being? because i am hearing a noise when i turn at the front (knocking noise). Or do you guys think alot of wearing will happen because of it.

this is weird! You can't find 225/45-18. I will give the bill to Mazda Australia asking why no 225/5-18. They should pay the difference to change the other 3 tyre to match size

That is, I doubt it is good at all to run cars with different size... let alone left is different to right!

OK, I just rang Quick Fit Tyre service. You can get a Kumho 225/40 R18 92W for $329.00. They load rating is slightly above the 91W for the stock Bridgestone. They say that they have got excellent customer feedback from this tyre, good tread wear, performance, and quiet, too.

I went to www.tirerack.com, checked over what was available in 225/40 18's, and then tracked down the AU websites to see what sort of product match I could find.

According to this site : http://www.1010tires.com/TireSizeCalculator.asp

The diff in size is 3.43% when going with a 225/40R18, that's a sizeable diff... the diff with a 245/40R18 is only 1%, which is acceptable. I'm not going to risk the 225/40s, have found plenty of 225/45s and 245/40s, but all rather pricey... looking at a set of Falkens for $395 fitted, just trying to find out whether they're any good.

OK, I just rang Quick Fit Tyre service. You can get a Kumho 225/40 R18 92W for $329.00. They load rating is slightly above the 91W for the stock Bridgestone. They say that they have got excellent customer feedback from this tyre, good tread wear, performance, and quiet, too.

I went to www.tirerack.com, checked over what was available in 225/40 18's, and then tracked down the AU websites to see what sort of product match I could find.


....eh labrat... I hate to do this and waste your effort....

225/45-18 is the size I think. I am pretty sure. :rolleyes:

oops, you're right. Back to the drawing board

OK, in 245/40R18's in Kumho you have:

Ecsta 712, load rating 93W = $328
Ecsta KU19, load rating 97W = $349

Check out www.kumho.com.au

Not bad for that price

How about the Y rated The Kumho ECSTA KU15 MX which is "an ultra high performance tyre and can be used on the track as well as on the road by motoring enthusiasts."

Saw a nice looking set of Made in Japan 235/40R18 Firestone Fire Hawks in my local Bridgestone Belconnen store for $299 a corner. Now, to quote Pepe, "just trying to find out whether they're any good".

I guess whether you fit 235/40R18's comes down to whether you accept the inherent errors in your odometer/speedometer reading(s). 245/40R18's will give practically zero error over the stock 225/45R18's.

Hey I found this Labrat that may be helpful

Tire calculator (http://www.miata.net/garage/tirecalc.html)

This is what I get for differenent sizes

Specification Sidewall Radius Diameter Circumference Revs/km Difference
225/45-18 101mm 330mm 660mm 2073mm 483 0.0%
235/40-18 94mm 323mm 645mm 2027mm 493 -2.2%
245/40-18 98mm 327mm 653mm 2052mm 487 -1.0%
255/40-18 102mm 331mm 661mm 2077mm 481 0.2%

Sorry that I can't line it up nicely as a table.. stupid forum :rolleyes:

Apparently the closest is 255/40-18. But for some strange law that we cannot upsize the tyre *can someone confirm that?*. The closest we can get 245/40-18 with -1% difference.

My understanding is you must
(a) meet tyre placard weight and speed rating
(b) meet the wheel rim/tyre width rating (and 245 is the max for 8" rim, ruling out 255/40)
(c) be within 10mm diameter of original spec; and
(d) must not affect speedo by more than 10% under the ADRs and various state registration authority interpretations of these.
Separate to this is how your insurance company views and modification. I have a 'verbal' from AAMI that 245/40-18 would be ok given the limited supply/choice of of 225/45-18s around. Three tyre shops said 235/40 are below the tolerance but I don't see how that could be

There is no way you will get 225/45 with a lot of choices. I will threaten the insurance company of leaving them because they have no common sense.

235/40-18 = diameter is 645mm cf. 660mm stock *(ie >10mm diam allowance), so I guess it is why they says no go. ;)

just a plug for my stock tyres if anyone is interested ;)

advetised in the FS section.

I have PM you let me know if acceptable to you .
cheers
michael