TYRE UPSIZE CALCULATOR
Select the Dimension of your Tyres to Determine the Overall Diameter.                While Changing your Wheel and Tyre Size, Focus on Overall Diameter to ensure Ride Height and Gearing to Remains the Same.

Original » Tyre » Size »	Tread Width	Profile Height	Wheel Diameter	Overall Tyre Diameter
	355 345 335 325 315 305 295 285 275 265 255 245 235 225 215 205 195 185 175 165 155 145 135   mm	85 80 75 70 65 60 55 50 45 40 35 30   %	23 22 21 20 19 18 17 16 15 14 13 12 10   inches	inches	mm
	NOTE: it is quite possible to select impossible tyre sizes or sizes that are not made!
New » Tyre » Size »	355 345 335 325 315 305 295 285 275 265 255 245 235 225 215 205 195 185 175 165 155 145 135   mm	85 80 75 70 65 60 55 50 45 40 35 30   %	23 22 21 20 19 18 17 16 15 14 13 12 10   inches	inches	mm
	We recommend ± 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