At what psi can I travel 65-75mph?
This Maxxis pdf has the same table. Using the table(s) above, my ST175/80R13 with 1060lbs load could run at a minimum 35psi with ~4% reserve capacity. Is there a +10lbs rule? I run with +1...
Forum Discussion
Francesca Knowles wrote:
Like all tire discussions, this one's been real interesting, but before we get too far down the ST vs. LT road:
The O.P. has 13" tires on his trailer and indicates no desire to upsize. I think there are few if any 13" LT's available.
I for one am looking forward to Goodyear's response to his inquiry about that 2011 service bulletin on the subject of inflation-for-speed. About time somebody looked into that mystery!
Thanks for going to The Horse's Mouth,, O.P....
The OP has a single axle trailer that he says weighs 2040 lbs on the axle or 1020 lbs per tire requirements. His OEM ST175/80-13 C at 50 psi had 1360 lbs capacity which gave him a 340 lb reserve per tire.
He now wanting to move up to a D tire for whatever reasons hence his derating a D tire with lower pressures questions. Or pump his 50 psi rated tires to a higher pressure. He needs to be talking with his tire dealer about over pressuring a tire above its max rating.
