Track Tires - RX8Club.com

blkswan · 2018-05-30 16:56:21

I just purchased a set of Enkei RPF1, 17x7 +40. I have a S2000 and looking to swap tires/wheels on the 8. Which tire size will work for both cars? I'm currently looking at Potenza RE-71 at Size: 255/40R17 98W XL. My car is stock height at the moment but looking to upgrade to ohlins very soon. Let me know. Thanks,

05-30-2018, 01:33 PM

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NotAPreppie

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Quote:

Originally Posted by blkswan

Will 17x7 +40 wheels fit on my rx8? I thought it needs to be 17x9 +40?

Yes, 17x7 +40 should fit and you might even find a tire installer able to get 255 to fit on 17x7 but you should definitely consider going to 17x9 all around if you want 255/40-17.

Wait, why did you change from 17x9 to 17x7? Which do you actually have?

If it's actually 17x7, then you probably want to limit yourself to 225 but you're going to have trouble finding tires in the appropriate 225/55-17 size to keep the speedo accurate.

Code:

Specification  Sidewall  Radius  Diameter  Circumference  Revs/Mile  Difference
225/45-18         4.0in  13.0in    26.0in         81.6in        777        0.0%
225/55-17         4.9in  13.4in    26.7in         84.0in        754        3.0%
225/50-17         4.4in  12.9in    25.9in         81.2in        780       -0.4%
225/45-17         4.0in  12.5in    25.0in         78.5in        808       -3.9%

224/45-17 will work but your speedo will read almost 4% higher than your actual speed.

Quote:

Originally Posted by Loki

The tires will fit, but don't the S2000's like bigger rear rubber than front? AP1 or AP2?
Also whether or not 255 will rub depends a lot on the offset of the wheels. Low offset = much rubbing.

Wait 17x7? There's no way you're going to fit a 255 tire on a 7" wheel.

Why not? B-Street/C-Street guys were running 285 on the OE rims. It wasn't ideal but you do what you gotta do within the limitations of the rules.

Last edited by NotAPreppie; 05-30-2018 at 01:37 PM.

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