Chain CheckerДЇirst, you can precisely measure the length (or health) of your chain with a chain checker. There are a few ways to accurately tell if you need a new bike chain without using the less-than-accurate, mileage-based decision. Upkeep is perhaps the most important rule-a regularly-cleaned and lubricated chain will last much longer than one left caked in dirt and debris. Different brands of chains wear differently, and varying riding styles and environments can dramatically impact your chain's lifespan. No matter what blanket statement you read online (most resources will say 2,000 miles as a rule), not all chains need to be replaced at the exact same mileage. Wait too long and you'll end up needing to replace both your chain and half your drivetrain, costing you more time and energy. This in turn can wear out the teeth on your cassette and chainring due to misalignment between moving parts. What does this mean? As a chain is used, the internal rollers and rivets wear out, causing the chain to stretch and lengthen. You may not notice a stark difference, but a worn out chain can impact your shifting efficiency and ultimately the condition of the rest of your components. It's easy to forget since a well-maintained chain doesn't squeak, and if everything is working properly, why replace it? We change our brake pads, tires and bar tape when they wear out, but many cyclists are unaware that bike chains have a shelf life too.

Mountain bike chain too long