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Old 02-13-2004, 10:15 PM
Tom Kirkham Tom Kirkham is offline
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Cobra Make, Engine: HiTech Legends GT500
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Lew,

Shelby American uses (or at least used to use) 295/50-15 tires on their cars. To calculate how the tires effect the speedo and gear ratios multiply the gear ratio by the ratio of the tire diameters.

1st gear in a C.R. toploader is 2.32 and 2.78 in a WR

The smaller diameter tire will make the car act like it has a higher number gear ratio in the diff. So you will be turning more RPMs with a shorter tire than you will with a taller tire.
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