Quote:
Originally Posted by darcane
On my Silverado, I was considering LT tires for my upcoming tire replacement since they would allow for me to run higher tire pressures. Are you saying that they will have worse rolling resistance in spite of the higher pressures? Some appear to have a good tread pattern for highway use.
Mike
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To facilitate this discussion I am going to assume your truck came with P metric tires. If you replace those tires with the same sized LT metric tires, and make the appropriate inflation pressure changes so that the load carrying capacities are the same, then the LT metric is pretty much guarranteed to have worst RR.
But if we factor in an increase in inflation pressure - which would be on the order of a 30 psi increase, then it becomes a bunch less clear. I don't think there is enough information to reasonably quantify it one way or the other - and my best guess is that it would be a toss-up.
The net effect is that going from a P metric to an LT metric at higher inflation pressure probably isn't going to net enough change compared to what can be done staying with a P metric and the changes that are possible with that combination.