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Calcimator

Motorcycle Gear Ratio

Calculate speed per RPM for different sprocket combinations.

Inputs

mm
RPM

Results

Speed

127.8 km/h

Speed

79.4 mph

Final Drive Ratio3
Overall Ratio5.52
RPM per km/h47
Rear +1 Tooth Change2.2%
Rear -1 Tooth Change-2.2%
How to Use This Calculator
  1. Enter Front Sprocket Teeth, Rear Sprocket Teeth, and Primary Drive Ratio.
  2. Set Gearbox Ratio (Current Gear), Tire Circumference, and Engine RPM.
  3. Review Speed (km/h) and Speed (mph).
  4. Use Final Drive Ratio and Overall Ratio to inform your decision.
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