Quote:
Originally Posted by eff
Try running more than 8 psi. My guess is that the tube is rotating inside the tire.
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That would be my bet - had it happen to me. Heavy tubes will spin under braking when you lock the rear wheel suddenly. Don't run HD MX tubes in low pressure trials tyres. At low pressure the weight will spin the tube and rip the valve. Make sure the tyre & tube are clean unusually you want as much friction between tube and tyre as possible. You could try looking for a bigger tube. The dilemma is that running more pressure negates the point in running a trials tyre. I found with a standard, lightweight 140/80 x 18 tube they are fine at 8 psi but go lower or use a heavy tube and they turn under sudden lock up braking. If you want to run lower, which I have you either need a bigger tube or maybe avoid the rear brake at speed on slippery ground.