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PSA: Your chain is worn out way before it looks bad, and a $12 checker proves it
I had a guy bring in a Trek hybrid to my garage in Boise last month, swearing the chain was fine because it still looked shiny and he'd only put maybe 800 miles on it. I dropped my Park CC-2 wear gauge in and it sank past 0.75 percent on the first try, so that chain was done. He'd already cooked his cassette and the middle chainring too, and what would've been a $25 chain turned into a $130 parts bill. Here's the thing most riders get backwards: a chain doesn't stretch, the pins and rollers just wear down and the links get longer, and you can't see that with your eyeballs no matter how clean you keep it. Once it goes past that 0.5 mark on an 11 speed setup, it starts eating the teeth and no amount of lube brings that back. I check mine every couple weeks now and it takes all of 10 seconds. What's your cutoff number before you swap, and do you go by the gauge or by mileage?
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