wilber1 wrote:
Interesting reply from Sailun. By recommending that you run at least 10 to 15 lbs over the the ratings given in the charts, he makes it pretty clear that you shouldn't get too cute with pressures and that these chart pressures are as stated in the chart title, "tire load limits for various cold tire pressures". Not recommended pressures. Why anyone would want to intentionally run a tire at near its load limit when it wasn't necessary is beyond me.
If you are going to use these charts to determine what pressures you need, you will also need to know exactly how much weight your tires are carrying. Due to their layouts, many rigs have substantial differences in left to right loading. My unit is a good example. It was weighed at the factory and came with a sheet giving actual UVW, pin, left and right side weights. Empty, my left side tires are carrying 600 lbs more than the right side and as most of the interior storage is also on the left side, that is probably more like an 800 lb difference loaded. This means that each left side tire would be carrying 400 lbs more than each right side tire with the trailer loaded. Just dividing the weight carried by the axles by four and using that to determine tire pressure from a chart could put me in an unsafe condition.
I use sidewall pressure for my E rated tires and as long as they wear evenly, I'll be happy to take the extra load capacity it gives.
I agree.
The difference between my tire that carries the least weight and the tire that carries the most weight is 560 pounds per my last trip across the scales.
