I do know the temp for the tire is real important and when up at Bandimere this last fall they were excellent and I was running upper 12's so for street tires the grip was good for 1/4 mile runs. Around town if the temp is above 70deg they perform well. I have had Invos and p6's that were not as good at upper temps but if cold they are just average for traction. The conti's had much less grip but better cold handling and the Michelin super sports were similar to the F 1's but cost more.