- Attaches to water bottle mounts on the down tube or seat tube of frame
- For use on frames with external Di2 wiring
- 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/
This is a Shimano SM-BMR1-L E-Tube Di2 Long Battery Mount for External Routing.