Originally Posted by mudman2
Westlake super st st185/80r13
An ST-tire is calculated in its maximum load for lower speed ( 65m/104km/h).
For that lower speed more deflection is allowed before the tire gets to hot so rubber hardens and damages at next bendings , so deflections.
Better would be to give the tire lesser deflection, the same it would need for 160km/99m/h, for wich LT tires are calculated in their maximum load.
Then still no bumping and centre wear of tire.
And gives as much possible reserve for things like:
Pressure-loss in time.
Misreadings of pressure.
Misyudging of actual load on tire.
Unequall load R/L wich can be as high as 10% difference ( weightdivision R/L of 45%/55%).
Lesser fuel consumption.
So if you can produce as much possible accurate data , I can calculate between wich pressure the tire is save and still comfort ( for the trailer?!)and gripp acceptable.
Can be even that it gives higher pressure then your AT-pressure of 65 psi, but this is not the maximum pressure of the tire, and most tire-makers allow 10 psi above it, and advice it for higher speed or better riding quality.