I run them on my car. Usually around 18.5 - 19 psi. My car is just under 3300 lbs. with Cal-Tracs amd mono-leafs. I've been a 1.29 60' and 9.27 foot braking. They work well. Do a light burnout and flip them every 10 runs or so. I usually kill the sidewalls before they wear out. They are also very stable down track, no sway at all and they don't grow which is nice if your wheel opening are tight.