Digital Integrated Intelligence or Di2: with programmed automatic motion at the touch of a switch the Dura-Ace Di2 rear derailleur is quick, smooth and effortless, making for unmatched drivetrain efficiency.
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• 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 • Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts • 11-27T wide gear ratio capacity will cater for compact setups as well as the traditional road double • Full carbon fibre inner and outer pulley plates enhance rigidity and reduce weight • Titanium B axle bolt for further weight savings • 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 • Pulleys are made of tough DuPont Zytel for longer life and less chain noise • 10-speed Dura-Ace Di2 compatible • Weight is 225 grams