Depends on what load rating and ply they are? Most likely they are E rated 10 ply tires like my stt's. I did the chalk test with mine and found them to run the flattest across the tread with 52psi up front and 45psi in the rear. That's just my tires though, your's may be different. I know one thing though, the E load rated tires have some crazy strong sidewalls!! I aired down to around 25psi in all four tires for our RC trip and they were BARELY bulging at all!