Quote:
Originally Posted by droolingmess
Had a service tech tell me one time that tires should never be run higher than 75% of the max rated inflation. Have never been able to verify if that if that is gospel or not.
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They don't know what they're talking about. I run my P rated tires at max pressure while towing. Anything less and they are way too bouncy. Actually, they're still too bouncy, even at max pressure. Trailer tires (ST rated) should always be run at max pressure per the manufacturer's recommendation.
When I had C rated tires on my other Tundra, I ran the rears at max pressure, 50 psi, even thought the load only required 38 psi. That provided the best stability and performance while towing.
If I had E rated tires, I would start with what OTFM recommended. I would verify the inflation with a simple chalk test (put a liberal amount of chalk on the tire in a line across the tread and drive forward while loaded. The chalk should leave a nice witness mark on the pavement. If the witness mark shows contact across the entire tread, you are not overinflated).
Tom