Tire upgrade air preasure?
I recently replaced the d rated Goodyear marathons with the new e rated Goodyear e rated endurance tires. The tire pressure on the the original d rated marathons were 65 lbs as listed on the factory s...
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OP..... I just did the same thing with the same model Goodyears. I went from stock "C" to Goodyear Endurance "E". The TT calls for 50psi, the new tires say 80psi.....for max load rating at almost 12,000#. My wheels are rated for 60psi maximum. So, after speaking with Goodyear, we concluded that I should run no more than 60psi for the weight (8600# max) that I'm hauling. There is absolutely no truth that the "E" rated tire should be run at maximum psi of 80psi.......as per manufacturer (Goodyear in this case). My truck even calls for 55psi front and 80psi rear with the same tires front and back for max load and it weighs a lot more in the front when not loaded. I run 50psi on truck all the way around when not loaded. Another thing that Goodyear brought to my attention was the damage possibly done to wheel bearings at 80psi, that I wasn't carrying enough weight for tires at max load psi to flex enough to cushion the blows. Goodyear has a inflation loading chart on their website, it should answer your very question. Like others have mentioned......be sure to check what psi your wheels are rated for also.
