Shimano Acera - Perfect control! The Acera component group stands for three properties: accuracy, precision and optics. This groupset enables precise shifting with less loss of pedal force. It offers high braking power and excellent braking effect for precise speed control and an attractive appearance with a slim profile. HYPERDRIVE systemhyperdrive system integration of SG-X chainrings, wide-link front derailleur and HG chain.The coordinated components optimize the chain guide and provide a precise, reliable derailleur shifting function, which is particularly important in demanding terrain.