just got off the phone to bill stuckey regading this tyre crap..
He laughed quite laoudly at the utqg rating, sayin thatsome tyres dont even have it. The better way to rule would be list the known r spec tyres such as the advan a048, direzza, dj01, re55, proxes 888 etc and ban them from street class. and to have a minimum tread requirement of say 2.5mm.
At a track like winton the new dunlop sport z1 with a utqg of 200 is 1 sec a lap slower than a dj01. by the same token those z1's on a heavy car like my clubsport are about 2 secs a lap faster than the factory potenza's with a treadwear of 140.