rhagfo wrote:
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That is an great example of why inflating tires to the MAX listed on the side wall is not the correct method. Mike is using the chalk test, tape works also, or an inflation table from the manufacture.
Not sure about how useful the inflation table is for this.
I originally set my LT-E Michelin LTX MS/2 LT245/75R17's on the previous truck at 45,50 psi (front,rear). Way over what was needed for the weights according to CAT scales and GAWR. But still they started wearing more on the outer tread, so boosted them to 60 and 70psi and that seemed to stop it. This was over 50K miles, mostly towing.
Never checked with chalk or tape. Should have; that would have been interesting and prolly a better method.
I understand the safety (and wear) issues of not over-inflating so to keep the max amount of tread on the ground. But reduced sidewall stiffness from under-inflation can also be a safety issue in terms of handling. My old P tires were very wobbly under load. Inflation to their 44 psi MAX helped, but LT-E tires were the real solution for me.
Anyway, getting back to the OP's P metric tires with a MAX of 51 psi, I have never seen a load inflation table for P metric that goes above ~41 psi? Does one exist for these newer, over 50 psi MAX, P metrics?
