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@chris_tim
I have this at the moment, I can see the chain dipping down slightly on the sprocket and then popping loose. I have also noticed the chain rises under tension on the sprocket in the same way it would on the chain ring to indicate wear, it doesn't rise on the chain ring. Not had a chance to check the wear yet but I only fitted the current chain (KMC 510HX) in April and although having done some millage I've not done a vast amount. Would it be worn already? If it is it has lasted less time that my SRAM PC7 which isn't great as KMC advertise it as stretch resistant blah blah blah....