Quick links, or master links, are used to connect both ends of the chain and are designed to be placed without the need for a specialized chain tool. You can add master links to a chain to lengthen it if needed.
You can use a SRAM, KMC, or Connex on a Shimano chain just fine, just match the speed of chain with the connector (ie 9 speed chain, 9 speed connector).
Using a chain pin: If your chain does not have a master link, use a chain tool to reconnect the chain with the chain pin included with your new chain. If you are repairing an existing chain, always use a new chain pin rather than reusing an existing pin. It’s possible to link a master link without a tool.
A master link or quick-release link is a roller chain accessory that allows convenient connection and disconnection of a chain without the need for a chain tool. It acts as a set of the chain’s outer plates, so joining two sets of the chain’s inner plate ends. Such master links may or may not be re-usable.
Do all bike chains have a master link? Nope, not all chains have master links. If your bicycle has derailleurs, it means it’s unlikely that your bike’s chain will have a master link.
IS KMC MISSING LINK COMPATIBLE WITH SHIMANO CHAIN, SRAM CHAIN, OR CAMPY CHAIN? Yes, KMC constructs Missing Link I, II, 9, and 10 for 7.3mm, 7.1mm, 6.6mm, and 5.9mm respectively; all Missing Links are compatible with Sram, Shimano, and Campy equivalent chains.
To find the master link on your chain, mount your bike in a bike work stand. If you don’t have a work stand, flip the bike over so it rests on its handlebars and saddle. Stand on the drivetrain side of your bike so you’re able to look straight down on the chain.