somewhere above 20 psi. i dropped them from about 32 to i think 25 or so? it was few years back at larue. they didnt really do very well, but they also dont prep their track on fridays. my soaked generals did better. granted i was also driving a FWD car with close to 500lbs trq at the wheels.
either way they are good ass tires just not for drag racing. i have two full 16" sets laying right here next to me. they do wonders on the MR2