I've been riding with the original chain on my Trek 4500 for 4+ years. I figured it would be a decent time to replace the chain so I don't have an "accident" in the middle of an adventure race.
Is there any reason I can't replace just the chain, such as drivetrain wear? Or, do I have it backwards, you should never use an old chain on a new drivetrain?
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Thread: Replacing a chain