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My 9R has 26,000+ miles and I'm still using the original chain. The bikes I had prior to this one were either shafties or I sold them before wearing out the chain so I have no idea how long the chain will last. This bike's a keeper.
I run the chain on the loose side and keep it clean and lubed. Seems to be fine but I wonder if it's about to fail catastrophically or something. How do you tell when it's time to change it?