Enter two tire sizes to compare diameter, width, sidewall, circumference and revolutions per mile, and see how a size change affects your speedometer. Works with metric (e.g. 265/70R17) and inch/flotation (e.g. 33x12.50R17) sizes.
Spec
Size 1
Size 2
Difference
% Diff
Side-by-Side View
Speedometer Difference
Speedometer Reads
Actual Speed with Size 2
Difference
Assumes Size 1 is the size your speedometer is calibrated for. Figures are calculated from nominal dimensions; actual mounted size varies by brand, tread, wheel width and inflation. Generally, keep overall diameter within about 1% of stock and confirm fitment before buying.
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