Motorcycle Gearing Calculator - RPM to Speed - Shift Tracer - Sprocket and Tire Comparison - Sprocket Spread Graph
Sprocket Spread Graph
Sprocket combinations that vertiacly align are equal in ratio.
Front Sproc Scope
Rear Sproc Scope
Align Sprocket Ratios
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.
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 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 ➋
and change the gear spread by selecting different sprocket combinations,
and using ➊
(Don't forget which gear to start in!)
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.
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.
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