Shimano BT-R1A External Di2 Battery 2.5mm/5mm/10mm/20mm Racing inspired speed and feel

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

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

5-65mm rate (lbs) 550 color red

110 IS Headset UpperSealed stainless steel bearings

Tooth Count 46 Drivetrain Speeds 12 Defined Color Black Ring Position/Type Outer Chainring BCD 107 Color Black Material Aluminum keyword search Rival AXS

Shimano BT-R1A External Di2 Battery 2.5mm/5mm/10mm/20mm Racing inspired speed and feelShimano 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