i wanted to ask if all of you running at nationals had shaved r888s or full tread depth, currently in my cup races ive been running full depth but in 1 sprint took off half the tread depth. also how long would the tires last shaved, do i need to buy another set or will my current set last me through the whole event. any information would be greatly appreciated due to my engin problem we havent been able to run enough to get sufficent data. does phills tire sell shaved tires at the event, and how much do people shave off? sorry i know thats alot of questions