TYRE SIZE 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 /speedo readings don't change
Old »
Tyre »
Size »		 Tread
Width		 Profile
Height		 Wheel
Diameter		 Overall
Tyre Diameter
  mm   %   inches   inches   mm
CHECK sizes you have selected are actually AVAILABLE!!!
New »
Tyre »
Size »		   mm   %   inches   inches   mm
Recommended ±2.5% is the MAXIMUM difference in diameters
Difference in Diameter: percentage =  %    actual =  mm
Use the TAB key to move between the fields then the ARROW keys to select the values
(SHIFT+TAB reverses direction of selection) or use the MOUSE to select from the Drop Down Boxes
NOTE: It is possible to select Tyre sizes that are NOT actually available !!

CHECK sizes you have selected are actually AVAILABLE!!!

Tyre size Calculator from www.tyresave.co.uk