- External battery mount for cylindrical (internal) battery (SM-BTR2)
- Low profile design easily mounts to any type of frame with bottle cage mounts
- Junction B function 6 E-TUBE ports with cable organizer
- Clean appearance thanks to internal wire routing
- System expansion thanks to E-tube platform
- Battery Case Di2 SM-BTC1
- Electric wire EW-SD50 (250mm)
E-TUBE platform offers optimum flexibility on your bike. E-TUBE transmits interactive signals and power supply to each parts by “Plug & play” connection. E-TUBE is no rust, no stretch, no freeze and it ensures advanced low maintenance. And SM-PCE1 connects between PC and components to update firmware. Digital device stay the latest version with updating firmware for improve function.