My belt has been making more noise than usual lately, just kind of complaining with its clicking under low load and I thought the tension idler needed extra help, ie., more tension. Added an extra spring so it's tight... on my way to the next town, three miles out from my house the belt gave way. Luckily it wasn't eighteen and I pedaled home. The short of it is this... my belt had been talking to me for about a month telling me it was tired and maybe coming to the end of its life. By over tightening the tension I helped to shorten the life of the belt by stretching the belt and the plys giving way at the weakest point. I guesstimate that I have 2000+ miles on this belt. That's not bad when you consider it has taken some time to feel and understand this system. The longer you ride a gebe, the better you come to know its nuances. Excessive tension on the belt, bad and gebers, listen to your ride it's talkin to ya!!!