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You've been saying you last replaced your chain a few months ago for more than a few months now, and if pressed, you'd have to admit you don't actually know how old it is anymore. Rather than waiting until you're 30 miles into a Saturday 60 miler and your chain falls off mid shift, you could invest in Shimano's TL CN42 Chain Wear Indicator to keep an eye on how much life your chain has left in it when you can still do something about it. Made with durable heat treated stainless steel, the Chain Wear Indicator uses a three pin structure to measure the give in your chain, and takes just a few seconds out of your pre ride ritual to check.
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