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Gear Ratio Calculator

Transmission Data

Gear 1st 2nd 3rd 4th Ring and Pinion
Ratio
Tire Size
Diameter Rollout
Inches cm
Maximum RPM
 

Directions:

1. Enter your gear ratio information, or use mine as the default.
2. Set your engine's maximum RPM or Rev-limiter point.
3. Calculate MPH,
Use the chart to determine the RPM drop for each gear at speed.