Trying to find the cause of belt failures in the X3 here. I have a theory that it is not due to heat, but possible overshifting in the clutch at high rpm. I lost a belt at very high rpm and if you have lost one, please post speed and rpm if you know it. I think the primary, at high rpm, is still expanding and trying to pull on the belt when its bottomed out on the secondary, stretching it and snapping it. If that is the case, and if most are failing at high rpm and not exploding from heat, then maybe a spacer in the primary would extend belt life. So if you snapped or exploded a belt, what rpm and speed? Thanks.