In-depth guide on upgrading your old Di2 bike
Does your old 10 speed Di2 bike need an upgrade to 11 speed? Want to add Synchro Shifting? This is the definitive Di2 upgrade guide.
External Junction B
Non-series components SM-JC40
The junction box SM-JC40 is used externally, when internal cable routing or an internal junction box (SM-JC41) is not possible. It is usually placed underneath the bottom bracket, fixed to the frame using a screw.
Affiliate Links
Using the affiliate links to purchase anything earns the site a small commission, at no additional cost to you.
Specifications
- Model code
- SM-JC40
- Series
- Non-series components (NON)
- Weight
- 8g
- SD50 ports
- 4
Related components
View all componentsRelated pages