Ultegra Di2 RD-R8050 Size:GS so you won't be losing

so you won't be losing bottles when the road gets rough

Thermal Compartment

Shimano cartridge-type brake pads are replacements for Dura-Ace

50mm and 70mm available

Capacity: 20g

Ultegra Di2 RD-R8050 Size:GS so you won't be losingThe new Ultegra Di2 derailleur now gets all the great design features from Dura Ace. Shimano Shadow Get a wide gear compatibility RD SS covers: 11 25T to 11 30T RD GS covers: 11 28T to 11 34T Maintain race concentration with more intuitive shift control System communication with front derailleur SHIMANO Synchronized Shift Specifications Specifications Manufacturer Warranty 2 years Position Rear Transmission Type Electronic Weight 242g (SS), 249g (GS)