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Tire Pressure Calculator

A starting PSI/bar map from rider weight and terrain. MX pressures are low on purpose — this is not a street-tire load table.

Inputs
Results
Live

  • Starting front

    13.25psi

  • Starting rear

    13.75psi

  • Front

    0.91bar

  • Rear

    0.95bar

  • Front

    91kPa

  • Why

    Standard MX starting point

Formula

Base 12–14 psi, then weight and terrain offsets

Tubes, mousses, and Tubliss all want different numbers. Use this as a first air-up, then read the tire after a moto.

Related calculators

Tire Size
Decode a size like 80/100-21 or 110/90-19 into diameter, sidewall, and circumference.
Tire Diameter
Overall diameter from a metric dirt-bike size, with a second path if you already measured the tire on the bike.
Tire Circumference
Rolling circumference from diameter or from a metric size. This is the number a speedometer calibration cares about.
Tire Wheel RPM
Wheel RPM and distance per revolution from speed and tire diameter — the tire-side version of the performance wheel-RPM tool.