The Specialized tyre on Mrs Davids bike has started to slip round on the rim (XC717). It moves to such an extent that if you start the ride with the valve vertical within 3-4 miles you'll have torn the valve off as the tyre has moved round and taken the tube with it.
I've tried cleaning the tyre bead/rim, with/without talc in the tyre and am now stumped as the back wheel has exactly the same tyre/rim combination and is fine and until 2 weekends both tyres had been staying out and working fine for over a year.
Anybody got any sneaky tips/handy hints or is it time for a new tyre?
Cheers.
DAVE
