Quote:
Originally Posted by ashtray
How much taller is a 255/40 over the stock? Looks a lot beefier in side profile. I'm thinking of going with 225/40 on an 18" gold RPF1. (unless I go for pure lightweight, in which case I'll keep stock tire size on 17x7.5's.)
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Using
this calculator I got that it was 10mm (1.6%) taller, meaning that my road speed is 1.7% faster than what the speedometer is indicating.
225/40/18 would put you at 11mm taller, road speed off by 1.8%.