Cobra Car Club of Victoria

Cobra Tools

Diff/Gear/Speed Ratio Calculator

Looking to change tyre size, or diff ratio?
Punch in your intended stats and get the RPM for 100km/h

 

Wheel size in inches (eg 15)
Tyre Size (eg 295 / 40) /
Top-Gear Ratio (eg 0.75) : 1
Diff Ratio (eg 3.45) : 1