When i was running 8.50 index, i used to run them until the cords were showing. How many runs?? well over 50. I remember going 8.40's with the cords showing. Lately i have been running them 30ish passes, but honestly the car has been broke or have been down for changes so i change them just to keep them fresh. IF given the chance, ill run them again to.....whenever as long as they are a year or less old.

I guess my real answer is if you have 8 sec or more ET car, and your suspension is working well....you can run them until???