Before changing the tires try raising the pressure up to17 or 18 lbs. and make sure you get thet tires hot, make them smoke in high gear around 6000 RPM for 3 to 15 seconds in two seconds increment up from 3 seconds to as high as 15 seconds, You'll know if the longer burn outs helps or not immediately on the launch from the starting line, don't break your neck or back AKA aside, a 1.50 60 ft. will hurt your back and or neck if you do not stiffen up for the launch, 1.20 60 fts. Are serious fun :hammerdevil: Can you say rocket ship launches