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.
Third-party brands like KMC often produce chains that are cross-compatible, but for the smoothest shifting performance, "replacing like-with-like" is the safest strategy. how to buy a bike chain
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. While most chains follow a standard "one-half inch