Originally Posted by Franck B
UHD tubes do not prevent snake bites from rims, as I could experience in Morocco (running 1.1-1.2 bars in stones). Simple heavy duty from Michelin are made out of sturdier gum and are really resistant, light and small enough for the same (extreme) use. UHD are also more difficult to mount and also to patch (since they are much less flexible they create lots of shear tension on the patch, which may eventually come off)
The only UHD tube I ever used gave me a flat from heat build up when I hit a fast paved section on a hot day, with a heavy load. I forgot to increase the pressure in the rear tire when I came out of the mountains and hit the highway at high speed, about 20 miles later, the dreaded wobble of a rear flat
A close inspection of the tube revealed a tiny leak on the seam and no punctures. I can only assume it was heat that did it. I run standard weight or regular HD tubes now, they are much easier to patch/replace on the trail.