I do not run tubes in my M/Ts. Have run 10.5x28W, 10.5x29.5, 10.5x31W. They leak through the sidewalls. Soaping the inside of the side wall slows it down pretty good. I don't screw them to the rims. Plus I can plug one if it hits a screw or a nail. 60 fts seem pretty consistent, low 1.30s.
Doug