The only problem I ever had with the GEBE kit was when new the tensioner would "jump" back and forth during hard acceleration instead of moving smoothly. Others have experienced the same jumping and have written about several cures. I tried several quick and easy fixes that only worked temporarily. The problem is one poorly engineered design flaw in GEBE's belt tensioner, the tensioner pivots on a threaded bolt. Pivot on threads? That's just Pi** poor engineering. I replaced the threaded bolt with a long bolt I found with a smooth collared section of the correct length near the head without threads. I cut off the unwanted section of the bolt, reversed it, used very thin brass washers on either side of the tensioner, lubricated everything with dry molycoat, and locktighted the standard, thin nut used to hold it on. It is necessary to draw the bolt fairly tight with only very little clearance(slop), but it must not be quite tight either. Perhaps a few thousandths of an inch of clearance is about right. I tried using a nylon inserted locknut, but it's extra thickness interfered with the spring and wouldn't allow the tensioner to stay off the belt when you tried to release the tension using the knob so you can pedal with no resistance. Following this modification the belt and tensioner operated as smooth as silk with zero "jumping". I wrote a thread here covering this mod, but no one seemed to notice it. I think the belt might last longer with less chance of breakage if the tensioner rides smoothly on the back of the belt, thus holding constant tension on the belt, rather than the tensioner binding then pivoting on the threads allowing the belt to be jerked on due to tensioner jump. It was quite difficult to start the bolt into the threaded hole with the spring tension on the bolt, but with patience I managed it. I hope this helps you.
