TYRESAVE Front Page TYRESAVE   TYRE SIZE CALCULATOR TYRESAVE Site Index 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 don't change Old » 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 82 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 It is quite easy 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 82 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 the MOUSE selects from the Drop Down Boxes Other Technical links: Tyre Speed Ratings || Tyre Load Ratings || Vehicle Wheel Fitment   © C. D. Clubbe