275/40r18

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Mar 30, 2007 | 10:45 PM

stubby

Thread Starter

Instructor

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From: Lower wetland Gods country

275/40r18

Hi all....

I've already run some searches in the hopes of finding an answer to this question. Lots of information on c5's and c6's, but did not find anything on a c4.

My question is this: Will 275/40r18's fit at all four corners of a 1992 coupe? Has anyone done this and if so, were there rubbing issues?

Thanks very in advance for any help you are able to provide.

Mar 30, 2007 | 11:13 PM

doug_dayson

Pro

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I believe you'd want 275/35/18's, no?

Quote:

Originally Posted by stubby

Mar 31, 2007 | 08:51 AM

RollaMo-LT4

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Joined: Oct 2005

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From: Rolla Missouri

2021 C4 of the Year - Unmodified Finalist

St. Jude Donor '10 thru '25

Quote:

Originally Posted by doug_dayson

I believe you'd want 275/35/18's, no?

I believe your '92 came with 275/40 17 tires. These tires would have an overall diameter of approx. 25.7 inches.

To compare:
275/40 18 = approx. 26.7 inches
275/35 18 = approx. 25.7 inches

As you can see the 275/35 18 would be the best choice when moving up to an 18 inch rim. This would keep your speedometer accurate also.

Not sure if the 275/40 18 would cause any rubbing issues or not, but since it's an inch taller it might.

Mar 31, 2007 | 01:42 PM

VenkmanP

Safety Car

Joined: Apr 2003

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From: VA

Quote:

Originally Posted by stubby

Tons of people run 275-40-18 (stock C5 rear) on the C4. Most of them in the rear, but some on all four corners. Never heard of a problem.

Apr 1, 2007 | 01:45 AM

stubby

Thread Starter

Instructor

Joined: Nov 2006

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From: Lower wetland Gods country

Thanks for the replies. They will certainly help with the decision making

Apr 1, 2007 | 02:02 AM

vinnies87

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Joined: Aug 2003

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From: Magnolia Mississippi

St. Jude '03-'04-'05-'06-'07

Quote:

Originally Posted by stubby

Hi all....

I've already run some searches in the hopes of finding an answer to this question. Lots of information on c5's and c6's, but did not find anything on a c4.

Just for grins, ran search and found 8 posts of your tire size....

Apr 1, 2007 | 05:17 PM

L71Maynard

Instructor

Joined: Jul 2004

Posts: 210

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From: Lakewood CO

My '92 had 275/40/18s on the car when I bought it. It did rub in the front. When I bought new tires I went with 285/35/18s and there have been no rubbing.