Tyre widths

[lunatic]

So the time has come for new tyres.

Current wheel setup:
2008 GTB w/ Prodrive PFF7's and stock Bridgestone tyres. Car isn't lowered at all

Now the 215/45 r18 tyres look too stretched on the 18x8 rim and i know that there are guys on here running 8" rims.

The question i have is, will running 235/40 r18 fail on suspension components or cause rubbing? Trying to stay as close as possible to stock rolling diameter.

Cheers,

Pete

[smythie]

With standard ride height and camber, you'll probably be fine. What was the offset of the wheel by the way? I know swingn has 225/40 tyres on the same wheel as you without problems. His is lowered too so I'd say you'll be fine.

[lunatic]

Offset is +51. 225/40's are 14mm shorter in height than stock, don't want to go with smaller overall wheel height.

Pete

[Hotwire]

215/40/18 certainly would have had a bit of stretch, however if you dont want stretch or to really go smaller rolling diameter, then I'd suggest 235/40/18 should be ok. With a 51 offset you *shouldnt* have any rubbing issues, and its only 7mm shorter than stock.

**EDIT**

Just had another thought - 215/45/17 is stock tyre size on earlier GTs (i.e. mine) so I'm going 225/40/18 on an 18x8 +45 rim which will increase my rolling diameter by 33mm.... yet its still 40mm shorter than your 18s!! 225/40/18 is still probably the better size for an 18x8 I believe.

[smythie]

Offset is +51. 225/40's are 14mm shorter in height than stock, don't want to go with smaller overall wheel height.

Pete

yeah, I realise there will be a difference in height, the 225 comment was in relation to scrubbing and width which if you are sticking close to the 215/45R18 OD is the problem you are looking at. Anyway, a width of 235 with an offset of +51 won't be a problem on the guards. might cause a bit of a scrub on the inside on full lock with a bit of suspension compression (I know my 215/45R18 Pilot Preceeda's do ) but I'm not sure that's a huge issue for most of the time you drive it

[GTSPECB STI]

worth having a look here perhaps http://www.rimtuck.com/photos.php?photo ... id=498&h=1

Check it out

http://www.rimtuck.com

Database of wheel fitments uploaded by users, with wheel data sheets and most importantly... photos!!

[smythie]

Damn! That front bumper is huge!

[coyote]

I have 235/40s on 8.5 wide +46 wheels and can tell you front strut clearance will be touch and go depending on tyre and wheel alignment specs.

Let's just say if you want more than -1 deg camber and are using Kumho KU36s, I reckon you "might" "just" foul on the trailing side of the front spring perch.

Best to find someone who will test fit and change them if it doesn't work.