Track Width Change Calculator

This calculator works by doubling the per-side wheel movement from an offset change. Track width is the distance between the center lines of the 2 tires on one axle.

1. Enter the offset change, for example −20 mm (lower offset).
2. Read the per-side movement: +20 mm outward.
3. Read the track change: +40 mm (+1.57 in).
4. Repeat for the other axle.

The formula is Track Change = −2 × Offset Change.

Worked example: a +10 mm offset change (wheels pulled in) narrows the track by 20 mm (0.79 in).

The conversion table converts 9 offset changes into per-side and total track changes. Track changes run from −40 mm to +50 mm.

A 25 mm spacer on each side of one axle widens the track by 50 mm (1.97 in).

The Track Width Change Calculator is a tool that measures how offset changes and spacers widen or narrow a vehicle's track. Track width affects cornering stability, steering feel and scrub radius.

Wider track lowers body roll transfer and widens the stance. A wider track moves the tire's contact patch outward from the steering axis, which raises steering effort and kickback.

This calculator has 4 uses: handling setup, front-rear balance, inspection records and legal checks.

• Set up handling: Widen track for more stability.
• Balance front and rear: Adjust track on each axle.
• Record modifications: Log track change for inspections.
• Check legal limits: Compare with rules on track changes.