The Eagle F1 supercar tires are a fairly soft compound. When I lapped last fall at a high speed road course (speeds over 155 mph) I took an amazing amount of rubber off the tires. In fact, all the tire grooves on the outside of the front tires were worn away. But, they bad boys sure do stick in the turns. The straight ahead traction at launch seems a little better than other tires I've run on C5 including Firehawks, and Mich. Pilots.