The slicks are srewed on with eight screws on each side of the rim and are tubeless, I never run less than 15 psi. The slicks are 6 mos. old and have less than 20 passes on them. I usually do a 3-4 sec. burnout in first gear only @ 4000 rpm. The rim are old and have nicks and need polishing, not very nice but are straight.