Suspension wheel rate and ride frequency calculator Suspension wheel rate and ride frequency calculator

Quick start

Calculate wheel rate and ride frequency, or solve for spring stiffness at a target frequency. Include tyre compliance and switch between N/mm and lb/in without changing the physical values.

  1. Enter your data and check the settings.
  2. Run the tool using the action button and review the result below.
  3. Save the last result; run the tool again after changing the settings.

Suspension wheel rate and ride frequency calculator

Calculate wheel rate and ride frequency, or solve for spring stiffness at a target frequency. Include tyre compliance and switch between N/mm and lb/in without changing the physical values.

Motion ratio means spring travel divided by wheel travel, including the installed geometry. Wheel rate = spring rate × motion ratio². Do not apply an additional angle correction to an already measured effective ratio.

k wheel = k spring × MR²

Ride rate = wheel rate × tyre rate / (wheel rate + tyre rate). Without tyre compliance, ride rate equals wheel rate. Frequency = √(1000 × ride rate / sprung mass) / (2π). Deflection excludes tyre compression.

A linear, single-corner approximation. Sprung mass excludes the wheel, tyre and other unsprung parts. Anti-roll bars, preload, damping and progressive geometry are not modelled. The result is not a suspension safety or tuning recommendation.

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