[V8] Tires and Wheels

[Ed Kellock]

Weight is definitely an issue, especially at an altitude of 6000 feet, power is already down.  

In regard to diameter and speedometer error, it is a good idea to stick with as close to the stock diameter as possible, but the variations we're talking about here amount to no more than 1 or 2 percent.  You can get that much in some cases even sticking with the same stock size but changing tire manufacturer.  Go to tirerack.com and compare the diameter spec for the same size tire from various mfr's.

If you can determine the variance in your tire size from stock diameter, you can easily apply that to your speedo.  

Ed

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From: "Coleman, David" <David.Coleman at blackrock.com>
Date: 2004/01/16 Fri AM 11:22:40 MST
To: "Coleman, David" <David.Coleman at blackrock.com>, 
	<jpb3wvu at frontiernet.net>
CC: v8 at audifans.com
Subject: RE: [V8] Tires and Wheels

> Your 245/45s have only 98mm sidewall.

correction:  your 245/*40*s have only 98mm sidewall.  Too short a tire.  Buy either a 255/40 or a 225/25.

Which brings up something separate... unsprung weight.  255s look better, and usually handle better, but it's heavier and might be a bit much tire for 240 horses to spin freely.  I tend to notice my car is more eager to accelerate with the winter tires on because they weigh less and have less rotating mass.

But I digress.  If I had 17s, I'd have 255s.

-dc
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