Another piece of advice is to actually measure the circumference of the tire instead of calculating it from the advertised diameter. There can be alot of difference.
To do this, inflate the tire to the normal pressure and measure all the way around the center. I have a tape measure specifically made for doing this.
Take the actual circumference number and plug that in to the formula. Its a heck of a lot more accurate this way.
Andy
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88 coupe
91 LX NMRA Pure Street 5120
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