Shimano Ultegra RD-R8050 Di2 11 Speed Rear Derailleur Axle Size_15 x 110mm the seatpost weighs a mere

the seatpost weighs a mere 200 grams

yet it delivers 2x10 performance and simplicity at a significantly lower cost

Teeth: 38t

2x Modular Multi-Purpose Interface

10-speed Dyna-Sys chainrings

Shimano Ultegra RD-R8050 Di2 11 Speed Rear Derailleur Axle Size_15 x 110mm the seatpost weighs a mereShimano Ultegra RD R8050 Di2 11 Speed Rear Derailleur Electronic shifting with precise and perfected movement across your rear derailleur, the Shimano Ultegra R8050 Di2 11 Speed Rear Derailleur, GS is a refined choice that provides the highest levels of technical accuracy in your groupset, allowing you the smoothest shifting experience possible. A programmed automatic motion allowing you to range across your gearing at the simple touch of a button,