New internal and external cage constructed of carbon fiber and aluminum tailor made for EPS Automatic repositioning, D.T.I. technology means that the EPS system knows the rear derailleur position and the selected sprocket at all times With the `Magnetic Hall Sensor Resolver`, the front derailleur always moves the chain automatically into the ideal position for the selected sprocket/chainring Front derailleur body in monolithic carbon fiber for low weight and high strength High torque, high drive ratio motors ensure effective shifting even under strain, deliver the same performance time after time and make extremely fast, precise shifts possible FD19-SR12BEPS 12sp Braze on CRBNUPC/EAN/GTIN: 8053340450068