Quote:
Originally Posted by BamaRam
The tires that came from factory are ST225/75R15 LRDs.
I was looking at the chart below which lead me to think that load rating was based speed. Like I said, I have a lot learning to do.
I know that tire pressure increases with heat. If I cold inflate the tire to 80psi and the hot pressure goes to 95-100, am I beyond wheel capacity?
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The tires are made to accommodate heat buildup when running at max psi.
Just looked at the chart. Don't know why they have @10mph on there - it's irrelevant apparently. Most just state max load at XXX pressure. The chart tells you the max load/pressure for each size tire and load range, wheel size etc. along with the speed rating for each tire; in your case, 81 mph. The speed WILL have a bearing on heat buildup in the tire if you exceed the 81 mph, which I hope you don't. Up to that point the chart indicates the LRE tire is good to go as long as you keep the weight below 2830 per tire at 80 psi and the speed below 81 mph. The LREs should give you a comfortable safety margin over the LRD tires that you have. They made a lot of difference on mine - peace of mind being tops.