whats the formula for

[APT88gt]

determining gear ratio? something about tire revolutions to driveshaft? I bought a car and I'm trying to figure out the gear

 

[347HO]

Driveshaft/Tire

 

[RangerJoe]

Try this website...they have lots of great calculators, and you should find one for what you are needing.

Wallace Racing - Automotive Calculators

 

[APT88gt]

thanks fellas

 

[Repostyle]

Mark the ds, then rotate the tire one full rotation, count the number of rotations the ds makes. 3 3/4 turns is 373's, a little over 4 is 410's etc.