Shimano BT-R1A External Di2 Battery 2.5mm/5mm/10mm/20mm Z-shape retro top plate provides

Z-shape retro top plate provides additional clearance for front derailleur cables

Racing inspired speed and feel with the everyday durability of nylon construction

Multi-use tool that is used to pre-stretch cables and to micro-adjust them

Model Metro Plus 680 Headlight Lumens 680 Modes 8 Rechargeable Yes Color Black Weight 140g

Shimano BT-R1A External Di2 Battery 2.5mm/5mm/10mm/20mm Z-shape retro top plate providesShimano 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