I went from screwed 15x 15 slicks to 14.5x 15xradials and no screws. Probably totaled 50 passes with a best. 60 ft of 1.25 in a 3000 lb car. Never lost any air, and very little if any over winter.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky