Originally Posted by TheRCF
Just curious of what I should expect for how long a chain should last as I have relatively little experience with this.
There are no set formulas for when a chain needs to be replaced. Replacing a cassette for every 3 chains and replacing chainrings for every 3 cassettes is rubbish. And if a bike shop ever tells you to purchase a new chain and cassette at the same time (unless both are actually hosed) find a new bike shop without incompetent employees.
Best to just buy an inexpensive chain checker and check it yourself for wear. To be on the safe side toss them a little early rather than a little late. If you wait a little late you risk doing damage to the rest of the drivetrain. If you toss them a little early, say 0.75% of recommended wear, you can keep your rings and cogs running smooth virtually forever.
Park Tools has a couple of different models. I bought the cheapest one (PT-CC3). A good 12" ruler will do the job but this one by Park is easier to use.
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