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Motorcycle Gearing Calculator
Interactive motorcycle gearing calculator: compare stock vs. modified sprockets, tires, and gearbox ratios. Real-time RPM/speed charts, slip factor, and telemetry reports for track tuning.
Gearing Telemetry System
SYSTEM ONLINE
Parameters
⟲ Reset
* Charts and telemetry update instantly on change
Telemetry Report
| Gear | Top Speed (Stock) | Top Speed (Mod) | Speed Δ | RPM Drop (Stock / Mod) |
|---|
Ultimate Gearing Simulator
Designed for track riders and hardcore modification enthusiasts, this analyzer simulates different sprocket sizes, gearboxes, and tire configurations. It precisely calculates limit speeds, acceleration characteristics, and the critical redline shift RPM drops.
Reading the Telemetry Chart
1. Sawtooth Curve: The trajectory of engine RPM vs.
ground speed. Solid line = Mod, Dashed line = Stock.
2.
Horizontal Drop: The fallback from redline to the
next gear's diagonal. If RPM drops too much, you may fall out of the
powerband, requiring a ratio adjustment.
3.
Changing Tires: Rear tire circumference directly
influences speed calculations. Enter using standard metric notation
(e.g., 180/55 ZR17). Use the Slip Factor to
adjust for tire slip and aerodynamic drag losses at high speeds (e.g.,
0.96 captures a 4% speed loss).
How to Simulate Gearing Changes
1
Select or reset a preset
Start with a built-in motorcycle (Yamaha R6, BMW S1000RR, or Ninja 400). Press Reset to return to the preset's original stock and mod values.
2
Set your tire size
Enter the rear tire in the format Width/Aspect-Rim (e.g., 180/55-17). The calculator automatically computes tire circumference.
3
Modify sprockets and ratios
In the Mod column, change front/rear sprocket teeth, primary drive ratio, or any gear ratio (1st–6th). The graph and table update instantly.
4
Adjust slip factor
Set a slip factor between 0.96 and 0.99 to account for tire slip and drivetrain losses. Extreme values show a warning but are clamped for safe physics.
5
Compare speeds and RPM drops
The table shows top speed per gear (km/h and mph) for both Stock and Mod, plus the speed difference and RPM drop after each upshift.
6
Analyze chain compatibility
Enter chain pitch (520/525/530) and total links. The tool calculates rear axle movement and recommends the optimal link count for the original wheelbase.
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