Di2 Junction-B Box SM-JC40 External

$29.99

$24.99

Model: Ultegra
Ultegra
Configuration

Description

Shimano Di2 offers the most precise and reliable shifting imaginable, at the push of a button. Adjust the derailleurs once, and the intelligent, auto-trimming system returns derailleurs to the same position every time. The intuitive and user-friendly design can be set up at home and accommodates any frame; new or old.

The Shimano Di2 SM-JC4 junction box connects the electric wires from the rear derailleur, front derailleur, battery, and shift levers. There are two types, external (mounted under the bottom bracket) and internal (for Di2 compatible frames.)

Model Number
SM-JC40
Item Code
P65-SSF-EXT
Di2 Junction-B Box SM-JC40 External

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LABORDAY20 saves you at least 20% off MSRP
on factory wheels, forks, frames, components, car racks, & travel cases.

LABORDAY30 saves you at least 30% off MSRP
on accessories, maintenance, shorts, tights, bibs, tires, & tubes.

LABORDAY40 saves you at least 40% off MSRP
on men's and women's jerseys, jackets and other tops.


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