The KMC e12 chain is a 12-speed chain that is optimized for use with e-bike drivetrains and is compatible with all electric bikes equipped with Bosch, Shimano, Yamaha, Brose mid-drive motors & all rear hub drive systems equipped with a 12-speed drivetrain. The e12 electric bike chain is KMC’s highest torsion resist bicycle chain that helps resist the increased torque applied to the chain from the drive units. provided by electronic power-assisted drivetrains. The design of the chain offers the highest pin power rating for the ultimate in strength & durability. Each KMC e12 chain ships with a missing link connector and has a length of 126 links to accommodate the longest of chainstays. The KMC e12 with added EPT protection offers 2 times more protection against rust and has been tested to withstand 650 hours of continuous salt spray. The EPT version is ideal for those riders riding in winter, wet conditions, or areas near the ocean.