Tyre Size Calculator
Calculate tyre dimensions (width, diameter, circumference) from tyre size. Compare two tyres and see speedometer impact.
Compare Tyre Sizes
Tyre Size 1
Tyre Size 2
Tyre Size 1 Details
205/55R16
Tyre Size 2 Details
225/50R17
Size Comparison
Diameter Difference
2.5 cm
Tyre 2 vs Tyre 1
Circumference Difference
7.82 cm
Per revolution
Speedometer Error
0.00%
Speed reading difference
Common Tyre Sizes
Understanding Tyre Sizes
Width: First three digits (e.g., 205) — tyre width in millimetres
Aspect Ratio: Two digits (e.g., 55) — sidewall height as a percentage of width
Rim Diameter: Last two digits (e.g., 16) — wheel rim diameter in inches
Example: 205/55R16 = 205mm wide, 55% aspect ratio, 16-inch rim
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