Overall diameter of wheels+tyres

hi all.

i know that the overall diamater of a wheels+tyres for 55/R15, 45/R16 and 40/R17 are the same.

anyone know if 35/R18 is bigger or the same?

well im having trouble wit my wheels. i bought new rimz they are 35/r18 and most places said they wont fit them for me cos the rolling diameter bigger than stock and they dont wanna do illegal stuff. But i found someone whos doing it 2moro ;) So i'd say bigger.

try using this calculator:

http://www.miata.net/garage/tirecalc.html

looks like 35's would be right for 18's (slightly bigger by 0.9%)

Quote:

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Originally Posted by tinkerbell

try using this calculator:

http://www.miata.net/garage/tirecalc.html

looks like 35's would be right for 18's (slightly bigger by 0.9%)

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Depending on the width, they don't neccessarily need to have a large rolling diameter. Try running a 205 or something like that and see how you go.

I'd do the calculations for you, but have no idea what the tyre you're comparing against is (size wise)

Theo..

I use this website.

http://www.1010tires.com/TireSizeCalculator.asp

I find it good, works for me perfectly. I managed to remove compliance tyres and put on original diameter tyres (not same size, but same rolling) and that brought my speedo back into close close to accurate.

thanks everyone for theh elp wth the links, they're all very useful. thanks :)