SHIMANO REAR Derailleur ULTEGRA Di2 RD-R8050-GS 11sp (KRDR8050GS)

SHIMANO REAR Derailleur ULTEGRA Di2 RD-R8050-GS 11sp (KRDR8050GS) 

- low profile Shimano Shadow RD design increases stability and reduces susceptibility to defects, provides compact appearance
GS
Direct Mount or standard