ROGUE TROOPER Posted December 30, 2005 Share Posted December 30, 2005 So if someone fitted 18 inch or 20 inch wheels, what size Aspect ratio tyres would keep the rolling radius the same? Ta Quote Link to comment Share on other sites More sharing options...
siggy Posted December 30, 2005 Share Posted December 30, 2005 215/70 x20 or 215/80x18 roughly match from here Quote Link to comment Share on other sites More sharing options...
dirtydiesel Posted December 30, 2005 Share Posted December 30, 2005 Grizley claws and bfg mt's measure 32.5" most others seem to be closer to 31.5" but it really depends on what width rim they are on. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 30, 2005 Share Posted December 30, 2005 (edited) Generally speaking you knock off 5% from the aspect ratio for every inch increase in rim size, so 235/85R16 235/80R17 235/75R18 etc etc should be roughly the same size within a few mm - near enough for gearing etc see also tyre size calculator very useful 20in alloys on a Series a bit bling though innit? Edited to say doh!! didn't spot Siggy's link.... Edited December 30, 2005 by BogBuster Quote Link to comment Share on other sites More sharing options...
MarkieB Posted December 31, 2005 Share Posted December 31, 2005 Although as you're probably looking at a wider wheel as well as bigger, a profile such as 305/50 R 20, 305/55 R 18, 285/60 R 18 would be similar diameter. graphical tyre calculator here although it doesn't go as far as 85%; I seem to recall it should be 31.2" although the other link says 31.73".. Quote Link to comment Share on other sites More sharing options...
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