KMC Phenomenal Shifting Performance Boasting many important benefits such as super-fast shifting, smoother action and even a significant reduction of "Chain-Suck", the KMC X11-EL chain is from a class of lightweight chains with hi-torsion resistance. This chain offers excellent gear shifting with its Double "X" Bridge shaped outer plate and comes with a non re-usable MissingLink included. It is compatible with Shimano, Campagnolo and SRAM and other 11-speed drivetrain systems.