What Is the Shimano SM-CN910-12 Quick-Link For?

The SM-CN910-12 is Shimano's 12-speed chain quick-link, designed for tool-free installation and removal of Shimano 12-speed HG chains on MTB and road drivetrains. Sold in a package of two pairs, it provides enough hardware for two complete chain installations or lets you keep a spare link at hand during events or long rides. The quick-link acts as a master link: the two opposing plates slide together and lock under chain tension, eliminating the need to push a chain pin with a chain tool during installation. The nickel-plated finish provides corrosion resistance at the link plates and improves long-term durability in wet and muddy riding conditions where untreated steel links can corrode and weaken over time.

Shimano rates the SM-CN910-12 as non-reusable. Once the link has seated under pedaling load, the locking mechanism should be considered spent and a new quick-link installed the next time the chain is removed. The SM-CN910-12 is compatible with Shimano 12-speed HG chains across the MTB lineup including the CN-M9100 (XTR), CN-M8100 (XT), CN-M7100 (SLX), CN-M6100 (Deore), and the road CN-R9100 Dura-Ace 12-speed chain. For anyone building, replacing, or regularly maintaining a 12-speed Shimano drivetrain who wants the factory-spec tool-free connection with the correct quick-link for their system, the SM-CN910-12 two-pair pack is the correct consumable.