Tire Size Calculator

Your details

First number in the size code, e.g. the 225 in 225/45R17. Tread width in millimetres.
mm
Middle number, e.g. 45 in 225/45R17. Sidewall height as a percentage of section width.
%
Last number, e.g. 17 in 225/45R17. Wheel rim diameter in inches.
in
Turn on to enter a second size and see a side-by-side comparison with speedometer correction.
Overall diameter (T1)
24.97in
Overall diameter (T1)634mm
Sidewall height (T1)3.99in
Sidewall height (T1)101.3mm
Circumference (T1)78.45in
Circumference (T1)1,993mm
Revolutions per mile (T1)808
Diameter T1 (in)24.97
Diameter T2 (in)-
Sidewall T1 (in)3.99
Sidewall T2 (in)-

A 225/45R17 tire stands 25 inches tall.

  • Each sidewall is 3.99 in (101 mm), making this a mid-profile tire.
  • The tire turns about 808 times per mile, which is what the factory speedometer and odometer are calibrated to.
  • When swapping sizes, keep overall diameter within roughly 3% of stock so the speedometer stays accurate and the tire clears the wheel well.

Next stepCompare a second size by toggling "Compare a second tire size" and check the diameter difference stays under 3%.

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