11-02-2014, 05:49 PM
I think they do have to rate every size as it also goes towards efficiency ratings of cars that might use a particular tyre as the standard tyre from the factory and obviously not every manufacturer is going to use one size of tyre.
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft