What will 3.73s do for my '01?

RDvenom99 said:

That ones nice too but it also takes into account the tire WIDTH that has nothing to do with the diameter. Someone please explain to me how having a wider tire with the same diameter is going to increase my speed at any given RPM? A 245/40/17 tire should run the same speed as a 315/40/17 tire shouldn't it?

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SVTRacer01 said:

A 245/40/17 tire does have the same diameter as a 315/40/17 tire, but only on the inside of the tire where it mounts to the wheel (rim diameter). The outside diameter of the two tires will be different though. The first three numbers of the tire (ie. 245, 315, etc.) are the overall width of the tire, while the second two numbers (ie. 40 series) are the aspect ratio of the sidewall height to tire width. Check out the specs @

http://www.tirerack.com/tires/tiretech/general/size.jsp

So, a 245/40/17 tire is 24.72" in diameter and a 315/40/17 tire is 26.92" in diameter. Over 2" in size.

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