The Shimano ST-6870 features Di2 technology shifting for easy and precise control - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear. Programmed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift. The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts. Key Features: Di2 technology shifting for simple and precise control Programmed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift Removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates, corrosion and stretching, and also provides effortless gear shifts Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts 11-32T wide gear ratio capacity will cater for compact setups as well as the traditional road double High tolerance cold forged aluminium link plates and body construction is extremely light and durable Four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting 11-speed E-tube Di2 compatible

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