Quote:

Quote:

The sidewalls on the 615k are pretty stiff, they can be run at fairly low pressure. I run 32 psi all around on street, 30 front 28 rear for autocross. Some of my competitors on them run as low as 26 F 22R....



Thanks for the reply. I was under the impression for autocross people added more air pressure.



I'd agree with what he mentioned as a base, in autocross, you want those tires to get hot as soon as possible since the run is so short. Lower pressures will help aid in that happening, cold tire grip [contact patch] is a big player overall.

1973 340 'Cuda 2013 Mustang GT