Connex 11SO 11 Speed Chain. 11 speed drivetrains demand a well constructed chain for optimal, quiet performance and the Connex 11SO model is certainly a superb choice. The 11SO is perfect for any manufacturer's 11 speed drivetrains and its durable, steel construction means it's also ideal for road or mountain bikes. The optimized geometry of the plates enables extremely rapid and virtually silent gear changes on all derailleur systems. The newly developed peripheral chamfering of the outer plate ensures optimum gear changing performance. And to withstand the high forces of cross gearing under load, Connex developed a completely innovative process for radial riveting. This radial riveting of the pins, in combination with a special pin coating, guarantees top performance and long wear, even for narrow width 11 speed chains. Additionally, this chain includes the renowned Connex Link which provides a simple, tool free means to connect or disconnect the chain.