Tire Speed Rating Question
I'm posting this here because the speed rating of a tire seems to me to cross all lines/types of vehicles. Reading up on warranty issues/questions just now, I came across the following language ...
Forum Discussion
CapriRacer wrote:
Just an FYI,
There's a provision that isn't well publicized about ST tires (LT tires, too) that you can over-inflate them 10 psi and that allows you to run up to 75 mph. If you also reduce the load by 10%, then you can run up to 85 mph.
So, yes, it is permissible to exceed the inflation pressure written on the sidewall - but only by 10 psi.
Can you do the math for me?
I have a single axle with ST175/80R13 50psi 1360lb rated tires. My heaviest wheel is 1060lbs. I run the psi from 45-50 now.
What pressure would allow me to travel at 65-75mph?
HTH;
John
