Tyresize Calculator

Select dimensions of tyres to determine the overall diameter
Matching overall diameters when changing wheel & tyre sizes
is necessary to ensure ride height and gearing do not change dramatically
Existing »
Tyre »
Size »		 Tread
Width		Profile
Height		Wheel
Diameter		Overall
Tyre Diameter		Tyre CircumferenceWheel revolutions
per Mile
  mm   %   inches   inches   mm   inches   mm
Note: It is Possible to select tyre sizes or sizes that are not manufactured.
New »
Tyre »
Size »		   mm   %   inches   inches   mm   inches   mm
It is advisable to have a ±2.5% MAXIMUM difference in tyre diameters
Difference in Diameter: percentage = actual =  mm
Speedometer Difference:percentage = % 
Speedometer Reading @   MPH  

Notes:
Wheel revolutions per mile information is provided to allow those fitting oversized tyres to calculate if differntial or gearbox ratios need to be altered to correct overall gearing.
speedometer information is approximate and provided for guidance only.

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