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Shimano SM-JC40/41 Di2 Junction Box
Sale price
$24.99
Regular price
$38.00
Prices subject to change. How pricing works →
On sale now — special pricing for a limited time.
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In Stock Ships in 1-2 weeks based on its location
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SKU: ISMJC40 Option: No Color / External
Pickup available at RA Cycles Brooklyn
Pickup available at RA Cycles Walnut Creek
Qualifying customers may be able to pay with their HSA or FSA through Flex. Flex disclosures (opens in a new tab)
Stock Availability by Location
RA Cycles Brooklyn In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
105 5th Ave, Brooklyn, NY 11217718-636-5242
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
RA Cycles Walnut Creek In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
2099 Mt Diablo Blvd, Walnut Creek, CA 94596925-433-7099
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
* Available for in-store pickup in 2-4 hours
Distribution Center - East In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
Distribution Center - Central In stockLow stock (1 left)Low stock (2 left)— Out of stock— Not immediately available
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Shimano SM-JC40/41 Di2 Junction Box
$24.99
Shimano SM-JC40/41 Di2 Junction Box Info
The Shimano SM-JC40/41 Di2 Junction Box is the four-port hub that sits at the heart of a Di2 wiring setup — routing connections between the battery, front derailleur, rear derailleur, and Junction A at the stem. Two variants cover the two standard installation approaches: the SM-JC40 mounts externally beneath the bottom bracket shell using the cable guide bolt (two bolt sizes included), while the SM-JC41 sits inside the frame, typically in the downtube or seat tube, secured with double-sided tape or left to rest freely given its compact, lightweight form.
Both boxes use Shimano's plug-and-play EW connector system, making routing and installation straightforward whether you're building a new Di2 drivetrain or replacing an existing junction box.
- Ports: 4-port configuration
- SM-JC40 — External mount, bottom bracket shell
- SM-JC41 — Internal mount, frame routing
- Compatible with Shimano Di2 electronic drivetrains
PRICE MATCH GUARANTEE
We will price match against advertised or quoted prices from other authorized dealers of the product!