Timing your purchase is as important as the purchase itself. Waiting until a chain "skips" usually means you have already damaged your cassette and chainrings.
For 11- or 12-speed systems, you should replace the chain when it reaches 0.5% stretch . For 9-speed systems or lower, you can usually wait until 0.75% . how to buy a bike chain
While most chains follow a standard "one-half inch pitch" (the distance between rivets), manufacturers like , SRAM , and Campagnolo design their chains to work specifically with the tooth profiles of their own cassettes. Timing your purchase is as important as the purchase itself
Always match the chain to the number of rear cogs. While there is some minor room for interchangeability in older 6/7/8-speed systems, modern drivetrains require an exact match. 2. Brand Ecosystems and Materials For 9-speed systems or lower, you can usually wait until 0
A new chain is a minor expense; a new cassette and crankset are not. Investing in a simple chain checker tool can save you hundreds of dollars by alerting you when it’s time to shop. Chain Compatibility | Park Tool
You will almost certainly need a chain tool to remove excess links. The most reliable sizing method is to lay your old chain next to the new one and match the link count exactly.