front tire size?
Pro
Joined: Nov 2005
Posts: 626
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From: Fresno CA
I'm getting ready to run 18's all around. I'm going to run 275x35x18 on the front. Check the diameter of your rear tires against the 275x40x18's. those maybe too tall. Not that they wont fit, but you'll loose your front to rear stagger.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
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From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Toque posted a link to this great little wheel/tire calculator which should help
http://www.rimsntires.com/specs.jsp
http://www.rimsntires.com/specs.jsp
Burning Brakes
Joined: Dec 1999
Posts: 815
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From: Richmond VA
According to Luke at Tire Rack the offset will work just fine with 275's. I checked using the calculater above and the 275/40 17 fronts and they are still 11mm smaller than the rears vs 19mm for the original 265's. So, I am still going for the 275's.
Race Director
Joined: Jul 2007
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From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
I run 18 inch on all 4 corners and 265/35/18 on a 9.5 wheel and 295/35/18 on a 10.5 wheel in the rear for tires.
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Race Director
Joined: Jul 2007
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From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
I think 11mm is cutting it close, Especially after rear tire wear.
Le Mans Master
Joined: May 2005
Posts: 6,366
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From: Fort Lauderdale, Florida
While a 275/40 may fit up front, it is actually too big in diameter. First of all it will look terrible being too tall. Secondly, a 265/35-18 is the same diameter as the factory 17" tire. I run 265/35-18 and 295/35-18 on my car on 10" and 11" wide rims.
Same here, with 285/40-18s in the rear (on 9.5" rims), which are taller than 295/35-18s. 
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Racer
Joined: Jul 2007
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From: Indianola Iowa
Le Mans Master
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From: Helotes TEXAS
Melting Slicks
Joined: Feb 2009
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From: SW Nuh Hampsha
2018 C5 of Year Finalist
TrueBlue, you started out talking about 275/40-18s in front, then changed midway thru to 275/40-17s.
Whereas the 275/40-18s are undoubtedly too tall, on a one inch shorter wheel, the 275/40-17s may be OK.
So which is it?
Whereas the 275/40-18s are undoubtedly too tall, on a one inch shorter wheel, the 275/40-17s may be OK.
So which is it?