Shimano Dura-Ace 7900 10 Speed Rear Derailleur:
This product from Shimano’s Dura-Ace line is aimed at rider putting in serious miles or doing a ton of racing.
The rear derailleur features a lightweight carbon cage and wide length design. The result of that is quick and accurate shifting and unmatched drivetrain efficiency.
The derailleur has the hard wearing dura-ace finish and graphics for long lasting good looks. It weighs just 166 grams, therefore suitable for weight conscious racers. Shimano has built this unit around an aluminum body to make it light while also being strong and durable.
There are full carbon inner and outer pulley plates, which enhance rigidity and reduce weight. Seemed pulley bearings reduce friction and create silky smooth movement.