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That is what I'm trying to avoid.   Is the second time I've heard of happening on these bikes.


My chain looks original and my bike only has 5000 miles but I will probably replace with brand new for precaution…….. using German Iwis type.  When in doubt, it's best to replace and consider consumable all parts which can cause such destruction or accidents if they fail.


In this regard, Primary chain and Layshaft bearings specifically come to mind.


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