Tyre size and rotational diameter chart


on Tuesday 13 November 2007
in A-Z Index - Everthing is listed in here > Tyres / Wheels / Hubs


The following is a table of tyre sizes and their overall diameter. 225/50/ZR16 is the stock Z tyre. Having a greater diameter will mean your speedo is reading less than your actual speed, having a smaller diameter will mean your speedo reads more than your actual speed.

Tyre SizeApproved Rim WidthOverall Diameter (mm)Revolutions per 1km
225/50/ZR166.0 - 8.0 632 529
225/45/ZR167.0 - 8.5608549
245/45/ZR167.5 - 9.0628534
225/45/ZR177.0 - 8.5633528
235/45/ZR177.0 - 8.5644520
255/45/ZR187.5 - 9.0687488
235/40/ZR178.0 - 9.5619540
245/50/ZR178.0 - 9.5677533
255/40/ZR178.5 - 10.0636526
265/40/ZR179.0 - 10.5642521
225/40/ZR187.5 - 9.0639524
235/40/ZR188.0 - 9.5644528
245/40/ZR188.0 - 9.5652514
255/40/ZR188.5 - 10.0663505
285/40/ZR189.5 - 11.0685490
225/35/ZR177.5 - 9.0590565
245/35/ZR178.0 - 9.5604553
255/35/ZR188.5 - 10.0635527
265/35/ZR189.0 - 10.5639524
285/35/ZR189.5 - 11.0657510
295/35/ZR1810.0 - 11.5661507
245/35/ZR198.0 - 9.5654512
285/34/ZR199.5 - 11.0680493
285/30/ZR189.5 - 11.0630531

Taken from Bridgestone brochure.