Interactive drivetrain toolBeta

Electric motorcycle sprocket ratio and speed calculator

Adjust the tooth counts and watch the sprockets redraw instantly. Add motor RPM, power, weight, and tire diameter to estimate speed, wheel RPM, and torque multiplication.

Live drivetrain analysisInputs · geometry · catalog matching

Your setup

Live geometry13T → 52T

Tooth counts and wheel size update instantly.

Drive and driven sprocket visualization The number and relative size of the sprocket teeth and the driven tire update from the controls. DRIVE 13T DRIVEN 52T REAR WHEEL Ø 24.0 IN

Sprocket size is proportional to tooth count, with a consistent tooth profile throughout. This is a gearing visualization, not a manufacturing drawing.

Estimated maximum speed98.3 mph158.3 km/h estimated
Gearing-limited speed107.1 mphRPM-based ceiling
Total drive ratio / torque multiplier4.00:11.00 motor × 4.00 sprocket · 4.00× ideal
Wheel speed1,500 RPM
Minimum motor torque at max RPM66.2 N·m48.8 lb-ft at motor
Estimated motor torque at max RPM51.6 N·m38.1 lb-ft at max RPM
Minimum electrical power for gearing cap46.2 kW41.6 kW mechanical after 90% efficiency
Potential 0–60 at entered peak power3.98 secusing entered 36.0 kW peak electrical power
Tire circumference75.4 in1,915 mm
Planning assumptions

These estimates assume a representative upright electric motorcycle and rider, street tires, level ground, standard air density, perfect bearings, 90% electrical-to-mechanical efficiency, 0.60 m² aerodynamic area, 0.015 tire rolling resistance, and a 1.2 g launch-traction ceiling. The 0–60 model assumes constant motor torque to 50% of maximum RPM, then constant power; this makes sprocket ratio affect acceleration while keeping the inputs simple. Entered peak electrical power must be available from both battery and controller. Estimated maximum speed is constrained by both gearing and available peak power and is not a guaranteed sustainable speed. Real results vary with motor torque curve, phase-current limits, battery sag, thermal limits, riding position, wind, road conditions, tire grip, wheel slip, and rotational inertia.

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