About Shimano Ultegra Di2 RD-6870 11sp Rear Derailleur
The Shimano Ultegra Di2 6870 Rear Derailleur makes shifting smooth, smart and fast. It shares DNA with its Dura-Ace 9070 cousin and features a much slimmer profile than the previous Ultegra Di2 rear mech, with 11-speed shifting capability. The wiring is tidier than before and this long cage (GS) version can stretch to a 32T cog in the rear.
E-tube technology is the key to Shimano electronic shifting, with advances in the package software allowing riders to customize shifting speed and even how many gears the rear derailleur shifts through when holding the shift button down. The 6870 rear derailleur even has built in crash protection, forcing the rear mechanism to compact and tuck away in the event of a crash. Ultegra has always been an enticing balance of both performance and value but Shimano has truly outdone themselves with Ultegra 6870 11-speed Di2.
Programmed automatic motion
Automatic crash protection
Contains a saver (fuse) function - the inner structure is protected from strong impacts
High tolerance cold forged aluminium link plates and body construction - light and durable
Four self-lubricating micro-machined fluorine-coated link pivot bushings for low-friction shifting
11-speed E-tube Di2 compatible
Wide gear range: 32T compatible (GS)
Cassette Compatibility: CS-6870 up to 11-32T
Construction: Anodised aluminum
Maximum Sprocket : low: 28T/ high:12T
Minimum Sprocket : low: 23T/ high:11T
Maximum Front Difference : 16T
Weight: 250g (SS - Short Cage), 260g (GS - Medium Cage)
Compatible with Shimano Di2 E-Tube Project.
More About The Manufacturer Shimano
Shimano, Inc. is a Japanese multinational manufacturer of cycling components, fishing tackle, and rowing equipment.
In 2005, the company had net sales of US $1.4 billion. Bicycle components provided 75% of its sales income. Fishing tackle produced 23% of the company's sales income, while other products—including snowboarding equipment and other forged parts—produced about 2% of its sales income. Headquartered in Sakai, Japan, the company has 32 consolidated subsidiaries and 11 unconsolidated subsidiaries. Its primary manufacturing plants are in Kunshan, China; Malaysia; and Singapore.