Went for my first wet weather ride. In preparation for the ride, I put extra pressure on the pinch roller and then clamped it down. Tires are 700c hybrids running 75psi. I looked at my rear tire at the pinch roller, and it is squishing the tire pretty good. I took off. My legs, back, butt, bike, tires, Titan, BMP and everything got thoroughly wet. I noticed no slipping at all. I weigh 175lbs, and was not pulling a trailer or load . Again. It pulled well with no noticeable slippage under full throttle pulls. At full speed I became more concerned about my tires slipping on the pavement and me wiping out around the corners . The Water was Flying. I was flying! Speed addict you know. So.. My supposition being purely anecdotal would be that the reason I had no slippage with thoroughly soaked tires was because.. 1- I am using the larger 1.25 sprag roller, 2- Extra pressure on roller and tire, 3- Pinch roller is new and has lots of tiny teeth, 4- Not pulling any Trailer with loads.
Since the 1.25 roller is a larger dia than the 1 inch, the 1.25 provides more contact area with the tire and also has less torque applied to the tire. Putting extra pressure on the roller also puts the roller in more contact with the tire. I must admit, I was pleasantly surprised there was no slippage using the parameters described above. I have a 1 inch roller coming and I will test it. I want to see what happens in the wet with this roller and also how easy it will be to switch rollers. A 1 inch roller would be what is needed to pull a trailer and load up bigger hills. I must say, I am impressed with this BMP with 1.25 inch sprag roller. Enjoy the ride...