After 10/12mn race tires are out of order and car undrivable at the point i must change them, i don't remember to do that before a only 20mn run?
i started with 77 rear/72 front first run and 76/60 2d one but same issue, i will try another setting to find solution or maybe it is just me lost habit to drive with degradate tires..
good luck for the run
