Suspension Wheel Rate Calculator

Inputs

Spring rate (k_s)

Installed spring rate.

N/mm

Motion ratio (MR)

Spring travel divided by wheel travel.

Installation angle (theta)

Angle between spring force line and wheel travel direction.

Sprung corner mass (m)

Sprung mass supported by this corner. Exclude unsprung wheel, tire, brake and part of the control arm when known.

Default result

Wheel rate(k_w)

28.13N/mm

Pass

Also computed

Ride frequency(f)1.43Hz

Effective motion ratio0.750

Method notes 2 notes

Motion ratio is spring travel divided by wheel travel; wheel rate follows the square of effective motion ratio.
Ride frequency is a linear sprung-mass estimate. Tires, bushings, damping, bump stops, anti-roll bars and progressive springs change the real response.