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If it dead hooks @ 8 lbs no need to go lower.The only reason to go lower is if its spinning the tires.As for 60' times they will always be better with as high of air pressure as you can run with out spinning the tires.

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I had a set of goodyear 16x33x15 on a set of 15 inch wide wheels, it would hook from 9.0 (I never tried higher) to 7.0 and o straight. I pulled them off, they where on the car before I bought it for over 6 yrs so I switch to a set of M/T 14x3`x15 stiff walls, I started of running them at 9.0 to 8.5 lbs, I have tried 12 lbs at the loacl track and it spun, I run 10.0 in them now on a bad track I advise new racers to pump the tires up until it stars to spin and the 60 fts. slow down and then go the other way on lower pressure until it slows down, make your decsion on what you like