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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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2
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RPM
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Drag Slider or Click individual Gear Buttons to change gears
Gear Max RPM

Primary
Top Gear



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Click to display a line graph of current gear ratios, then edit ratios and click again to add graphs and compare gearing sets.


R

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Check the Compare Sprockets box and drag the Front and Rear sprocket sliders to visually align different gears and see all available gear spread combinations for different sprocket combinations.
Hit Shift and Trace to trace speed difference at RPM for each sprocket combination.

Front / Rear
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Find Bike Data




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When tracing, Shift AT entered RPM

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When tracing, Shift so the RPM drops TO entered RPM

RPM
Slow Fast



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Shift AT entered RPM

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Shift so the RPM drops TO entered RPM


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 Sprocket 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 Compare Sprockets 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

Gear Spread Options Gear Spread Combination Options?
For whatever reason you use your bike (racing etc) you may not need every gear available.
If you don't really need 1st gear (too low) or you never get into top (too high), you may be able to get a better gear ratio spread by changing sprocket combinations, and using different gear set selections.
Most motorcycle gearbox ratios get closer together as you go up through the gears.
So for example, if you have a 6 speed box, but only really need 5, you can make =   or   = and change the gear spread by selecting different sprocket combinations, and using ----   or   ----   (Don't forget which gear to start in!)

Another example: Using 16/40 sprockets - 1st is too low, 6th is just right. Using 20/46 sprockets puts 5th where 6th was, and makes 1st taller (more legs off the line?). You only have 5 gears in the spread compared to 6 before, but if 5 will do, you've fixed the 1st gear too low problem.

Gear Spread Comparison

Check the Compare Sprockets box, and drag the Front and Rear sprocket sliders to visually align different gears, and see all available gear spread combinations for different sprocket combinations.


Transfer Saved Bikes Load Transfered Bikes Motorcycle specs To find gearing data for your bike, try motorcyclespecs.co.za and gearingcommander.com







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Inch or Metric? 👈
The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm)
Directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
Drop Down Menus have M for Metric Versions.



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