I recently had the pleasure to ride in some blm land north of twin falls Idaho. Every now and then the road (two ruts in the terrain) would turn to soft sand. Most of the time I had about an 18 inch wide path to navigate. I tried to stay in the power band in second, but the road turned and had unepected rocks, making maintaining speed an issue. Luckily I was barely moving the three times we (riding two up with the misses) dumped it. I have 19 psi in both stock tires. And I am curious how low I could have gone on my air pressure. We were never more than 10 miles from our support truck, and an air compressor was available there. What is a good air pressure on sand?