I'd appreciate any help with this problem I've been having. I have a Kona Unit 29er frame that is a couple of years old. (purple model) Since I built the frame up I've had a consistent problem with the chain falling off. It happens when I'm pedaling hard through rough or rolling terrain. Usually when I am pedalling on and off. My rear wheel is a dmr hub/ dt swiss rim and an acs freewheel. The chainline seems straight and before each ride I tighten the chain. I've been running it tighter than I should have to and that seems to help keep the chain on but it usually still comes off at least once on my rides. A local friend who is a framebuilder seems to think that it is flex in the rear end at the bottom bracket ./ chainstay junction. The chainstays are welded to a piece of plate steel which is welded to a short piece of tubing then to the bottom bracket shell. I do notice how much flexier the rear end is compared to my Waltworks frame. Is this a problem with all these Kona frames, or is their another problem that I'm failing to diagnose?
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