Has anyone running Proxes RA-1s with the IT-S wheel size (15x7) tested out for the best pressures (hot or cold)? Ive been playing around with it, and have been running about 30psi cold latelly, although Ive been suggested to run lower pressures. Ive found a decent consistency with my pyrometer at those pressures, but still would like to know if anyone has found anything different.

Any input?

 

While I have a pryometer, I don't have crew so using it effectively proves difficult. I have been happy though with about 31-32 cold PSI on my RA-1's 225/50/15 on a 7" wheel. Ambient temps will play a role, that's at about 90 degrees outside. One thing I have been doing, not sure how correct it is, set the temps at about 32 PSI all around and run a full session. Right after I come in, I check the temps and balance them out, usually dropping a few tenths of a lb in a tire or two. My temps are usually around 37PSI at this time. I have not run below 30 PSI before.