Fitment engineering tools

Tyre Diameter & Lift Calculators

Compare tyre sizes, speedometer difference, ground-clearance gain and the combined effect of suspension lift plus tyre diameter.

Tyre comparison

Overall Tyre Diameter Calculator

Enter the current and proposed metric tyre sizes. Example: 265/60R18 to 285/60R18.

Current width (mm)Current profile (%)Current rim (in) New width (mm)New profile (%)New rim (in)

Alternative sizing

Alternative Size Finder

Creates common alternative widths, profiles and rim sizes and ranks them by overall diameter difference.

Original width (mm)Original profile (%)Original rim (in)Maximum difference (%)

Vehicle height

Suspension + Tyre Lift Calculator

Shows approximate chassis/body lift and tyre-only differential/axle clearance change.

Suspension lift (mm)Current tyre diameter (mm)New tyre diameter (mm)

Important: Diameter calculations are geometric. Actual mounted diameter varies by tyre brand, pattern, load, pressure and approved rim width. Always check manufacturer specifications, clearance at full steering lock/compression, gearing, speedometer calibration, load index and local legal requirements.

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Tyre Diameter & Lift Calculators

Overall Tyre Diameter Calculator

Alternative Size Finder

Suspension + Tyre Lift Calculator

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