rjsurfer wrote:
I have BFG 235/16's also on a small 26 foot 5th wheel and 70psi is about perfect for it.
I did an simple test my dad showed me, paint a white 2" stripe across the tread of your tires and run the car/trailer a few miles loaded. It's easy to see how the tread is wearing by taking a look at the wear of the stripe. This works for checking tire alignment as well. Tires have to be fairly new for this to work well.
Ron W.
People also use chalk on the tread and drive a short distance or drive over a piece of white paper.
In my case we started with 65 lbs with the XPS Ribs in Feb 2005. That is what the placard called for and matched the load table. After a couple years I measured a slight more wear on the outer edges and adjusted pressure to 71 pounds. Tires wore evenly after that.
One is hard pressed to wear out a RIB or R250 on a RV trailer. Just watch for cracking as they are getting older and enjoy them for 6-8 years. They both have low rolling resistance due to the steel ply carcass.
Chris