Shimano Dura-Ace RD-9070 Di2 11 Speed Rear Derailleur

TheShimano Dura-Ace RD-9070 Di2 11 Speed Rear Derailleurfeatures Digital Integrated Intellegence (Di2). Thanks to its programmed automatic motion, at the touch of a switch this rear derailleur is quick, smooth and effortless to shift, providing you with unmatched drivetrain efficiency. The removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contamination, corrosion and stretching. The derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts. This rear derailleur has a 11-28T wide gear ratio capacity to cater for compact setups as well as the traditional road double. The Shimano Dura-Ace RD-9070 Di2 11 Speed Rear Derailleur,short cagehas full carbon fibre inner and outer pulley plates which enhance rigidity and reduce weight. 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. Shimano Dura-Ace RD-9070 Di2 11 Speed Rear Derailleur Features Titanium B axle bolt for further weight savings Pulleys are made of tough DuPont Zytel for longer life and less chain noise 11-speed E-tube Di2 compatible Programmed automatic motion Carbon pulley plate Saver (fuse) function protects inner structure from strong impact Wide link design to reduce shifting deflection by increasing rigidity Precise shifting over an extended time period Max rear sprocket: 28T Max front difference: 16T Total capacity: 33T Weight: 217g "