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For Inch versions, directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
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Motorcycle Gearing Calculator - RPM to Speed - Shift Tracer - Sprocket and Tire Comparison - Sprocket Spread Graph

RPM gauge diagram Speedometer gauge diagram


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Gear ratio RPM shift point graph diagram RPM

Sprocket Spread Graph - Sprocket combinations that vertiacly align are equal in ratio.

Front Sproc Scope Rear Sproc Scope Focus

Sprocket Spread Graph

Align Ratios

Max RPM RPM Increments

Enter gear ratios, primary ratio, sprocket sizes and tire diameter, then drag RPM slider to calculate speed from RPM.
Drag Max RPM slider to adjust the range of the RPM and Speedometer Gauges.

Enter Shift at RPM, select gear to shift to and hit Shift and Trace to run up through the gears recording shift point RPM and km/h - mph.

Compare sprockets Check Sprockets Compare and enter alternate sprockets for comparison. The speedometer will display 1 needle for each sprocket set.
Or run Shift and Trace then hit Copy Diagrams to copy diagrams to page footer, edit and repeat to compare multiple combinations.

To calculate Chain Link adjustment to maintain rear wheel postition when changing sprockets, use our Chain and Sprocket Calculator

Transfer Saved Bikes Load Transfered Bikes Motorcycle specs To find gearing data for your bike, try and

DON'T BREATH THE DUST If you're cutting blocks, concrete, stone or ANYTHING and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
And if you're cutting wet, wear a mask - theres dust in the spray mist too!

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Check relevant local regulations for appropriate sizes, spacings and all engineering requirements.

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