Originally Posted by dalemonroe
We put some 205C 14 Kumho 857 tires on the trailer. They have a load rating of 2270 lbs each at 65 psi. They will only be carrying 1550 lbs each. What pressure should I carry in the tires? The original Marathons were inflated to 50 psi.
It's a little unclear, but is the 1550# figure an actual worst case load on the tire? Or is it the result of weighing the axle?
Assuming it is based on the axle load - I would add 15% to the value to account for the side to side variation, then add 15% to that to add unused (reserve) capacity - and the result is 2050#.
And lastly, I don't think there is much of a risk of the wheel failing due to pressure. Everything I have been able to gather about wheels says that load is way, way more important than inflation pressure.
Then going through the load calculation, the result is 61 psi. Rounding up results in 65 psi - and since this is the max, it would be easy to remember.