Mine have been on for 10 years and no problems, run 10 to 12 psi depending on track conditions with a 1.40 60ft. I do raise them off of the ground if the car is going to sit for an extended amount of time...Matt

70 Dart 3400 496 New Best 6.15@110.37 660ft, 9.76@135 with a 1.34 60ft