RE: Tire Size Conversion

["Gary H." <62to65mopar@xxxxxxxxxxx>]

For your 1965 (or 1962s to 1965's)

A. Divide 63.36 by the car's tire circumference. The circumference is 
tire diameter times 3.14. (e.g.,a 26 inch tall tire has 81.64 
circumference so 63.36/81.64 = .776

B. Multiply that result by 8 (8 x .776 = 6.208)

C. Multiply that result by your axle ratio (e.g., 3.23 x 6.208 = 20.05)

The result is the number of teeth needed on your car's speedometer 
pinion, or 20 in the example above.

Gary H. 

Bill wrote:
...
> I'm trying to find info on how to convert modern tire sizes
> (215/75/14) to the old sizes (D75-14). I ultimately want to figure out
> what is the correct speedo gear is for my current setup....


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