SM-BTC1 mounts current SM-BTR2 battery externally next to bottle cage
-Junction B function
-Six E-tube wiring ports with cable organizer
-System expansion thanks to E-tube platform
-SM-BTR2
-The SM-BTC1 mounts Shimano's SM-BTR2 on a bike's water bottle bosses and also acts as a Junction B, connecting wires from the shifters to the battery and derailleur.
-Available for Pickup within 2 to 1 businesses days