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I last had a chain fail three years ago, it being a gold X-ring DID chain with about 4000 miles on it. It let go for no apparent reason at about 90mph. The only suggestions I've had were a manufacturing fault or a stone or other road debris being carried up onto the chain and dragged around one of the sprockets. Mercifully it split quite cleanly and got spat off the rear sprocket only taking a small chunk of the gearbox sprocket cover and the whole chain guard with it.
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