Shimano BT-R1A External Di2 Battery Model=Garmin Specialized Future Mount 6 Defined Color Black Stack

6 Defined Color Black Stack Height 36 Weight 137 Color Black Material Aluminum Length 50 Bar Clamp Diameter (mm) 31

K-Edge Gravity stem cap mount for Garmin Edge and Forerunner 1/4-turn type computers

Tubular CroMoly rack stainless-steel hardware

Rebound Rod) - Deluxe Ultimate RCT (C1)

Shimano BT-R1A External Di2 Battery Model=Garmin Specialized Future Mount 6 Defined Color Black StackShimano BT R1A External Di2 Battery. Shimano Di2 Batteries. Must purchase battery charger and power cable to complete the system. All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http: e tubeproject. shimano. com TECH SPECS Shifter Derailleur Compatibility Dura Ace 7970 Di2 Shifter Derailleur