I have 315/17's in the rear. My best 60ft is a 1.7 with only 9#'s of pressure in the tires. I don't mind them but I still can't launch over 2000rpm with them or I will bust them loose, even with a good burnout. I like them for the street though. I think for track tires I'll go with some Mickey's next time though and switch them at the track. 555R's will only last you about a year if you like to spin the tires. You don't need to heat cycle them. Just do a very good burnout, they get nice and sticky. Our return road has some loose asphalt chips on it and it sounds like it's raining when your coming back, the tires pick everything up and throw it in your wheel wells.