285 vs 275
Race Director
Joined: Oct 2005
Posts: 11,773
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From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
No, no problem at all.
You would probably have to be close enough to actually read the size on the sidewall in order to tell the difference anyway.
You would probably have to be close enough to actually read the size on the sidewall in order to tell the difference anyway.
Pro
Joined: Jan 2010
Posts: 504
Likes: 2
From: Rockville MD
Pro
Joined: Jan 2010
Posts: 677
Likes: 39
From: Southern Indiana
Something to consider though is your front tire size. That is, if you are running say 255/45/17 up front (as some later C4s do) then a 275/40/17 out back will mean that your rear tires will be over 1/3'' shorter (total diameter) than your fronts... And that may be noticeable. So if you go with 275s out back you may want to go to 245/45s up front (those two sizes are a perfect match height-wise). If, OTOH, you are already running 275s up front then nevermind... You're good.
Just be sure to do the math & keep f/r correctly proportioned & you'll be good!
Just be sure to do the math & keep f/r correctly proportioned & you'll be good!
Thread Starter
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
Thanks Jon I was thinking about that difference between 40 & 45's but how would the narrower width cause the tire to lose height it shouldn't matter should it? If it calls for 45's up front and 40's in the back it should not make any difference on the width should it?
I asked in another thread but what rim size is the minimum to mount 275's on. In other words do I need to get new fronts to run 275's all around?
I asked in another thread but what rim size is the minimum to mount 275's on. In other words do I need to get new fronts to run 275's all around?
Last edited by Redeasysport; Oct 21, 2010 at 07:20 PM.
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Pro
Joined: Jan 2010
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From: Southern Indiana
the '45' in 245/45/17 is the sidewall height (aspect ratio) which means that it is 45% of the width (245) of the tire. Therefore a 245/45 will be a bit shorter than a 255/45. IOW it's relative to the width.
Last edited by 1allspub; Oct 21, 2010 at 07:42 PM.
