Track Width Change Calculator

Calculate the change in track width through suspension travel for SLA (double wishbone) suspension geometry.

Input Parameters

Results

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Track Change in Bump
in
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Track Change in Droop
in
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Maximum Tire Scrub
in
--
Scrub Rate
in/in
Note: Track width change causes tire scrub, increasing tire wear and resistance. Longer control arms minimize track change. SLA suspensions have inherently less scrub than MacPherson struts.

Reference

Horizontal at Ride = Arm Length x cos(Arm Angle) Bump Angle = arcsin((Arm x sin(Angle) + Bump) / Arm) Horizontal at Bump = Arm Length x cos(Bump Angle) Track Change = Horizontal at Position - Horizontal at Ride Scrub Rate = Total Change / Total Travel