njansenv

I'm looking at a set of Cayman S 18's to use as summer/Autox wheels.

fronts: 18 x 8 ET50 with 235/40 ZR18 Michelin PS2
rears: 18 x 10 ET47 with 265/40 ZR 18 michelin PS2

I believe the wheel sizes are fine, but am concerned on the tire sizes. The OD is about 5% different by my math (Front to rear), so barely within the allowable C4 limit of 6%.

Will these fit? I'm ok with rolling fenders and mildly flatting the oil line as necessary.
Suspension will be H&R Reds + Bilstein HD dampers, RS or slightly more agressive alignment.

Thanks!

njansenv

Anyone? I found some references to people using similar size tires, but just wanted to confirm.

crg53

From TireRack's website

235/40/18 819 revolutions/mile
265/40/18 790 "
265/35/18 822 "

So the 265/35/18 seem a better match.

njansenv

Oh, I understand and would certainly prefer to go with 35 series rears, but the wheels come with great PS2's of a taller than stock size. When the time comes to replace them, I'd go with the appropriate size. If the tires don't fit, the wheels lose their appeal.

njansenv

Anyone?

sml

235/40 & 265/35

8ET50 is fine ... https://rennlist.com/forums/964-foru...nd-photos.html

10ET47 should be fine ... here is 10ET40 which was a tight fit but will be good info for you ... https://rennlist.com/forums/964-foru...ghlight=10ET40

njansenv

Thanks!