Campagnolo Super Record EPS 12Super Record EPS 12 speed rear derailleur High torque motor provides fast and crisp shifting even under the highest loads Increased chain wrap improves shifting performance and reduces drivetrain wear Derailleur trajectory optimized for use with 11 29 and 11 32 cassettes 12 teeth ceramic pulleys reduce friction UnLock System allows to manually position the derailleur in case of system failure or if the battery runs out IP67 waterproof rating ensure