SM-JC41
Brand: Shimano
Junction B of the Shimano Di2 11-speed system, in the built-in version housed inside the down tube for fully hidden wire routing. Its four E-Tube SD50 ports link both derailleurs, the battery and junction A. At 4.1 g it is the lightest Shimano junction B. The SM-JC40 is the external equivalent.
| Type | Electronic shifting accessory |
|---|---|
| Model years | since 2011 |