I started at 28 which is what I run on the street and it actually seemed to hook up pretty good. Then I went to 24 and it broke loose a little so I went to 18 thinking ok they are going to be soft and should hook great but, on that pass, I broke them totally loose so I'm baffled. I wasn't running much fuel at all... probably only 4 gallons on the first pass and then down from there plus I might have been stalling up a little more each time but not by much. I probably stalled at about 2000 on the last past. One thing I noticed was during my burnout the tires wouldn't produce smoke hardly at all. Are you supposed to heat these tires up or not? I just couldn't believe how bad I broke them loose when they were at 18. I wanted to keep dropping them until the rearend started feeling loose on the big end and then add just enough to take that away.