View Full Version : What would 225/40ZR18 to the drivability if the 8?


subduedracer
01-30-2006, 04:57 PM
I have a set of tires I'm looking at that are a decent deal. Not sure if I will like the size. (in referance to hieght) Opions tire techS?

carbonRX8
01-30-2006, 05:02 PM
I have a set of tires (http:///#) I'm looking at that are a decent deal. Not sure if I will kike the size. Opions tire techS?Is that a politically correct post? You have something against a certain religion?

As for the tires (http:///#). Your speedo will be wrong a bit, but otherwise the diffs should be minimal. Why dont you just get the right size?

EDIT:Oh, and if you get 225/45-18 or 225/40-18 you better have 18 inch rims (#). If you have 17, your tires might fall off! http://www.rx8club.com/showthread.php?t=81686

sstricker
01-30-2006, 05:04 PM
Is that a politically correct post? You have something against a certain religion?

As for the tires (#). Your speedo will be wrong a bit, but otherwise the diffs should be minimal. Why dont you just get the right size?

Oh, and if you get 225/45-18 or 225/40-18 you better have 18 inch rims. If you have 17, your tires might fall off!


HAHAHAHAHAHAHAHAHA... i was wondering the same thing!!! :yelrotflm

guess he could always smoke a bowl....

expo1
01-30-2006, 05:10 PM
As for the tires (http:///#). Your speedo will be wrong a bit, but otherwise the diffs should be minimal. Why dont you just get the right size?

From http://www.miata.net/garage/tirecalc.html The speedo would be 3.4% too fast, 60 mph would really be 58.

My track tires are 235/40/18 and run great, can you get that deal on that size? Speedo diff on that size is 2.2% too fast.

carbonRX8
01-30-2006, 05:12 PM
From http://www.miata.net/garage/tirecalc.html The speedo would be 3.4% too fast, 60 mph would really be 58.

My track tires (#) are 235/40/18 and run great, can you get that deal on that size? Speedo diff on that size is 2.2% too fast.That is great, so you would get a torque boost to boot.

subduedracer
01-30-2006, 05:15 PM
Great info expo1.

musclecarconvrt
01-30-2006, 07:20 PM
Before you buy, check out the Kumho 245/40 18's on www.TireRack.com. Hard to beat the price. I think I paid around 135 per tire a year ago. All the other comperable tires were in the 180 range. It's a good tire too. I didn't even make it a full year on the stock tires. They were bald in 11 months! These Kumho's handle better that stock and are lasting longer to boot. Fits perfect.

GeorgeH
01-31-2006, 06:22 PM
Beware of bent wheels. I've bent several of the OEM wheels on the 225/45 profile - reducing the sidewall by 10% is just going to make things worse.

Also, make sure the load rating is sufficient for the RX-8.

subduedracer
02-02-2006, 09:34 AM
I went with 245/40 ZR18 Yoko's. ES100
Looks great so far

musclecarconvrt
02-02-2006, 09:40 AM
Cool, Please let us know how you like 'em. put a lot of miles on my car and may need a new set of tires by summer or fall.

Philip_SA
02-06-2006, 03:02 PM
Hi all

I have the same problem of having to fit new tires.I also thought off fitting 225/40-18 as they are exactly 3 times cheaper, than the 225/45-18.(here by us in SA) in Rand a 225/45-18 is about R2700 to R3300 per tire, the /40's are between R900 and R1100 per tire.
Can you believe it,they say that /45 is not a common size ?
This now will also let me go for 225 or 235/40.

Thanks guys

I want to buy lowering springs and are looking at: TeinStech, H& R, Racing Beat, and Eibach on Rx7store.net.
the TeinStech price is good does anyone have a problem with them