If it has fallen off then my suspicion would be that it's FUBAR.
If it's been tightened up to the correct torque and still falls off then it suggests that the taper is not within specifications- probably on the crank arm as it is alloy and the axle is steel (and therefore much harder).
If it has fallen off then my suspicion would be that it's FUBAR.
If it's been tightened up to the correct torque and still falls off then it suggests that the taper is not within specifications- probably on the crank arm as it is alloy and the axle is steel (and therefore much harder).