Will It Fit Thread - Page 447 - RX8Club.com



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Old 08-27-2017, 10:45 AM   #11151
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After some time and more research and teasing myself, would like to bug the knowledgeable again with a more specific inquiry/verification :p

From what I understand rummaging through as many related threads as possible is as follows:

Stock diameter is 26" and the general rule is to stick within 3%, and besides a special case rim design, 17" is the lower limit rim for the bigger stock brakes. I mention the special case because of some info from I think wrx forums squeezing a specific rim that was an inch smaller than they usually could (iirc 15" over their brakes where most rims that size would rub); other than that you can go as large a rim as you can find a width and profile to match your desired closeness to original diameter (minus % giving a slight gearing effect such as going to a higher ratio diff (in case I say that terminology wrong, I intend the direction of say 4.444 to 4.777, shorter gear right?), which on a non lowered car might slightly affect perceived wheel well gap.

So next, ignoring diameter as much as it can sensibly be done, the maximum no fender mod and still clear suspension (assuming you aren't bulging the tires) is 10.5 +42. At this width, 265 is a near perfect match as it is 1.7 mm less wide (10.5" = 266.7mm). Depending on manufacturer sidewall characteristics along with rim height plus profile used, going wider could start to cause issues, less wide could give more clearance but you begin to get the 'stretched' look. And just for putting the info I received using calculators, this 265 tire on 10.5 +42 would be 24mm closer to suspension and 40 mm closer to fender compared to the stock 8" +50 offset wheels (in case this info would help others). Some have squeezed 285s iirc.

Aftermarket brakes bigger or smaller would change your wheel height lower limit range, coilover/suspension mods and fender rolling/pulling extends your width. For every half inch you can squeeze in more width doing this, you need to subtract approximately 6-7mm from your offset to keep the wheel 'centered' similarly, ex: 11" +36. Adding makes it more convex, subtracting makes it more concave (deep dish). The amount you adjust needs to take into account 1" = 25.4mm. With this info it should be relatively easy to place the wheels where you want them within a controlled margin of error. To stay flush with more narrow rims, you add offset that relates to your goals and choices. So doing head math and using the stated info so far, 'flush' on stock 8" rim width would be +73-74? (2.5" = 63.5mm /2 = 31.75mm increased off set from the 10.5 +42 flush)


So, with all that info I've gleaned and possibly misunderstood;
I could go with Bridgestone potenza s-02 265/35R18 tires on work meister m1 18x10.5 et+42 wheels on a stock 8 with no roll/pull, though be pretty much at the limit.

I still plan a possible 1-2" drop from stock. Alignment goals would be a minimal toe in front and rear for straight line stability, camber to around -2.4 front and -2.1 rear, and max caster after camber is set; but the merits of those settings from that research is for a different thread, but it still affects tire position and rubbing potential, so added it

Will be waiting for responses to learn what I've gotten wrong and right
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Old 08-27-2017, 02:11 PM   #11152
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Quote:
Originally Posted by zeropeorth View Post
After some time and more research and teasing myself, would like to bug the knowledgeable again with a more specific inquiry/verification :p

From what I understand rummaging through as many related threads as possible is as follows:

Stock diameter is 26" and the general rule is to stick within 3%, and besides a special case rim design, 17" is the lower limit rim for the bigger stock brakes. I mention the special case because of some info from I think wrx forums squeezing a specific rim that was an inch smaller than they usually could (iirc 15" over their brakes where most rims that size would rub); other than that you can go as large a rim as you can find a width and profile to match your desired closeness to original diameter (minus % giving a slight gearing effect such as going to a higher ratio diff (in case I say that terminology wrong, I intend the direction of say 4.444 to 4.777, shorter gear right?), which on a non lowered car might slightly affect perceived wheel well gap.

So next, ignoring diameter as much as it can sensibly be done, the maximum no fender mod and still clear suspension (assuming you aren't bulging the tires) is 10.5 +42. At this width, 265 is a near perfect match as it is 1.7 mm less wide (10.5" = 266.7mm). Depending on manufacturer sidewall characteristics along with rim height plus profile used, going wider could start to cause issues, less wide could give more clearance but you begin to get the 'stretched' look. And just for putting the info I received using calculators, this 265 tire on 10.5 +42 would be 24mm closer to suspension and 40 mm closer to fender compared to the stock 8" +50 offset wheels (in case this info would help others). Some have squeezed 285s iirc.

Aftermarket brakes bigger or smaller would change your wheel height lower limit range, coilover/suspension mods and fender rolling/pulling extends your width. For every half inch you can squeeze in more width doing this, you need to subtract approximately 6-7mm from your offset to keep the wheel 'centered' similarly, ex: 11" +36. Adding makes it more convex, subtracting makes it more concave (deep dish). The amount you adjust needs to take into account 1" = 25.4mm. With this info it should be relatively easy to place the wheels where you want them within a controlled margin of error. To stay flush with more narrow rims, you add offset that relates to your goals and choices. So doing head math and using the stated info so far, 'flush' on stock 8" rim width would be +73-74? (2.5" = 63.5mm /2 = 31.75mm increased off set from the 10.5 +42 flush)


So, with all that info I've gleaned and possibly misunderstood;
I could go with Bridgestone potenza s-02 265/35R18 tires on work meister m1 18x10.5 et+42 wheels on a stock 8 with no roll/pull, though be pretty much at the limit.

I still plan a possible 1-2" drop from stock. Alignment goals would be a minimal toe in front and rear for straight line stability, camber to around -2.4 front and -2.1 rear, and max caster after camber is set; but the merits of those settings from that research is for a different thread, but it still affects tire position and rubbing potential, so added it

Will be waiting for responses to learn what I've gotten wrong and right
Most of it makes sense....except the red bit I highlighted. You want to move the hub face towards the center of the stock wheels...so you would subtract the amount you want to move them out. So on a stock wheel if you want to move them out 1" you subtract the 1" from the +50 offset and end up with a +25 offset approximately

The tire sidewall profile can make a difference when you are getting to the 10.5"265 profile tires. Some will fit and others not so well...and you might need a bit of a roll
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Old 09-23-2017, 02:36 AM   #11153
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Front wheels are at 235/40/18x8.75 +22 sitting on bc coilovers. Question is, what size spacer would I need to flush this? I'm going with ichiba hubcentric spacers
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Old 09-23-2017, 11:17 AM   #11154
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Quote:
Originally Posted by rotpow7672 View Post
Front wheels are at 235/40/18x8.75 +22 sitting on bc coilovers. Question is, what size spacer would I need to flush this? I'm going with ichiba hubcentric spacers

Depends a lot on alignment and tire profile and fender position. Easiest thing is to take a straight edge on them the way they sit and measure how much room you have at the point that will cause rubbing first.

Honestly there can't be much room now I wouldn't expect
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Old 10-05-2017, 06:07 PM   #11155
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I really like the fitment on this members 8 and I'm thinking of purchasing work emotion d9rs 18x9.5 but idk what offset to go with to achieve this look. Help pls? Will the front wheels fit the same way with equal offset all around? Also what tire size should i go with?

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Old 10-13-2017, 10:35 AM   #11156
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Those are probably somewhere around a +22mm offset, but he has MEGA stretched tires on there (can't say I'm a fan of the stretch) and those would definitely rub on the front fender liner without a bunch of cutting.

If it is just the flushness of the tread to the fender you like, mine are 18x9.5 +30mm and they are nice and flush all around:





These are 255/35 tires, I didnt want to risk any rubbing but you could fit 265/35 tires on too and they would poke out from the fenders very slightly.

Last edited by RotaryMachineRx; 10-13-2017 at 10:43 AM.
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Old 10-13-2017, 01:59 PM   #11157
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Cosmis Racing

I am in for a set of Cosmis Racing Xt-206r 18x9" ET33.
My current set up is stock rim 18x8 Et50 wrapped in 235/40/18 dunlop rt2.
Also coilovers from Bc Racing are installed lowering the car around 1inch (25mm).
| Will They Fit says
"Compared to your existing wheel, this new wheel will have an inner rim which is 4.3mm further away from the suspension strut. The outer rim will poke out 29.7mm more than before."
So will it fit with no issues?
The car is daily driven
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Old 10-26-2017, 12:27 PM   #11158
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I did a couple of searches and tried reading through the 447 pages to find the answer to my questions but gave up. Please forgive me if I should have been able to find this on my own.

I have a new to me RX8 in need of new rims and tires. I found some Mustang GT rims that appear like they would fit based on what I have read but wanted to make sure before I committed.

1) 18x8x40mm Have 235-50 Pirelli tires on them. Mostly interested in knowing if these would be a good tire size for the RX8?
2) 19x9x45mm No tires. Would I be better off buying these and getting some tires? If so, what would be a good recommendation?

Thanks in advance
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Old 10-26-2017, 01:58 PM   #11159
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1) Those tires are ~5% larger than OEM. That means that you'll be going 5% faster than your speedo indicates. I don't see any reason why they won't fit unless you're slammed.

2) I don't know about inboard clearance. The inner rim of the wheel will be about 7.6 mm closer to the suspension components.
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Old 10-26-2017, 03:09 PM   #11160
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the worst thing you can possibly do is put different size wheels and tires on the same RX8. It will negate the RX8's handling advantage and you can't rotate tires properly which is going to result in short tire life and increased cost.
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Old 10-26-2017, 07:24 PM   #11161
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Quote:
Originally Posted by NotAPreppie View Post
1)
2) I don't know about inboard clearance. The inner rim of the wheel will be about 7.6 mm closer to the suspension components.
That shouldn't be an issue with clearing suspension

Quote:
Originally Posted by TeamRX8 View Post
the worst thing you can possibly do is put different size wheels and tires on the same RX8. It will negate the RX8's handling advantage and you can't rotate tires properly which is going to result in short tire life and increased cost.
Team I think he just has two options for tire sizes, not staggering them, but I agree a square setup is much more practical.
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Old 10-26-2017, 08:30 PM   #11162
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Yes, thank you. I have the option of 4 same size tires with rims or w same size rims without tires. No plans to go different sizes.
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Old 10-27-2017, 09:01 AM   #11163
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IMO you are better off with option 2, the tires on option 1 are too meaty. With option 2 I'd say you'd be okay with the 255/35 or 265/35 option.

255's will be exact same size as stock on the 19's but with just over 1" more width.
265's will be slightly larger diameter than stock and will be about 1.5" wider, but I'm unsure about rubbing up front with the 265's; would probably be minor if at all though.

Last edited by RotaryMachineRx; 10-27-2017 at 09:16 AM.
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Old 11-01-2017, 01:01 AM   #11164
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Would a 17x7.5 +40 with 215/45R/17 fit?

currently I’m running the tires on some kinda wheels that are 17” (that came on the car when I got it)
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Old 11-06-2017, 09:34 PM   #11165
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for giggles I put my 18x11.5 +42.7mm wheels on my rx8 from my rx7 with 285/30/18 tires. It fits and I do get an ever so slight rub in the rear, I mean the fender lip just grazes the tire on big bumps. The car is not slammed but is lowered on Ohlins dfv. The handling is much better than my 18x9.5 2454018 R-S3 tires. The 285's are re-11 tires.

The wider the wheel with a slight stretch of the tire does wonders for grip and handling. I do think the wheel might touch the control arm at full lock, but I am not going to try it moving. a safer bet would probably be a 18x11 +45mmish offset or a 18x10.5 +47mm would be a good one. run a 265/35/18 or 275/35/18 if you want to stay stockish tire diameter, the gearing seems a little better with a shorter tire.

the looks make those tires above look anemic.
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Old 11-14-2017, 01:26 PM   #11166
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Looking at some 17" rims that I would be using on a track car. It appears that 245/45-R17 and 245/50-R17 are a little wider and about the same height. Anyone running 17's that can comment on what works well? Rims are 17x8 +45.
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Old 11-14-2017, 06:49 PM   #11167
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How about 17x9-9.5 up front with 255-275 and a 17x10.5 rear with a 315-35-17

17's specifically because i want to retain a good amount of suspension travel, while also keeping the unsprung weight down....

I have a similar setup for my 3000GT that is +27mm offset that I test fitted - Way too much poke for my liking, specifically in the rear.

Can I stuff a 315 in the rear on a 10.5 without more than a mild fender roll? Un-needed Negative camber just to tuck the wheels in more is not for me - so that does not count...

I'll keep reading back to see if I find anything like it, but most of these seem to be Show-Fitment based setups so far. I do alot of canyon like street driving, and I plan to have about 400whp or so from a NA 3 Rotor unless I have a really good year and feel like having a watered down 4 Rotor stuffed in my RX-8 (Don't judge)
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