Quote:
Originally Posted by PopBeavers
Another thought. Find out the maximum load for the tire. ... I would need P tires rated for 1,700 pounds. I don't think P tires will carry that load.
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The P tires I mention above have a load index of 111 which I guess translates into 1090kg each (2403# each) at 42psi. And the truck I'm looking at has axle ratings (depending on configuration) of up to 2177kg (4799#). So two of those tires at 42psi matches the max rear axle rating.
It's a new truck with the original tires, so one would expect the tires to match or exceed the axle ratings.
My question about side wall depth had more to do with the tire's rigidity, especially under load. I would expect the low profile tire to be more stiff, less squirmy (if both were inflated to the same tire pressure). I understand that's why race cars have such extreme low profile tires. But the tradeoff is a harsher ride, and for an off-roader (and any place with pot-holes), the possibility of banging the tire on the rim.
But the difference between 166mm (.65x255mm) and 151mm (.55x275mm) is only ~10%, so it's probably not a big issue anyway.