I've broken 2 tubes that connect the aluminum frame to the seat stay. Bionicon recommended that I also put a zip tie in the middle of the tube so there are 3 ties holding it to the frame which I have done (not too tight--it is firm but not bending the tube) and I have ridden over 100 miles of rough trails without a breakage.
Thought I would just pass the tip on to other owners.
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Thread: Bionicon C-Guide V2 breakage