DRAC Calculator Page


Major thanks go to Will Finn at 614streets.com for doing ALL of the legwork to reverse engineer the numbers behind the DRAC. All I did was convert the tables to a formula and write this spiffy CGI app to do the calculations for you.

 

 

If you include both, the circumference is used.

Tire Circumference: -OR- Tire Designation / R
Rear gear ratio:
Pulses/Rotation: