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TyresZone tool

Compare tyre sizes with confidence.

See how diameter, width, ride height and speedometer readings change before you choose your next set.

Tyre size calculator

Compare two tyre sizes

Enter the original size and the new size to see exactly how the dimensions change.

Tyre 1 · Reference

245 / 45 R18
VS

Tyre 2 · New size

255 / 40 R19
Format: Width / Aspect Ratio R Rim
Example: 245 / 45 R18

Visual comparison

Tire Size Comparison Visualizer

Tyre 1 · Reference245 / 45 R18
Calculated
Tyre 1 · Reference realistic tyre and wheel
678 mm
245 mm
R18
Diameter677.7 mm
Width245 mm
Sidewall110.3 mm
Rim18 in
Tyre 2 · New size255 / 40 R19
Calculated
Tyre 2 · New size realistic tyre and wheel
687 mm
255 mm
R19
Diameter686.6 mm
Width255 mm
Sidewall102.0 mm
Rim19 in

How tyre size comparison works

A metric tyre size combines width, aspect ratio and rim diameter. Sidewall height is width multiplied by the aspect ratio, while overall diameter adds both sidewalls to the rim diameter. Comparing circumference helps you understand rolling distance, revolutions and the speedometer effect of a different tyre.

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