# Shimano SM-JC40 Di2 External Frame Junction Box 4-Port

Shimano Di2 Frame Junction Box-   Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur rear derailleur cockpit junction box and battery mount
-   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/

## Details

- **Price:** 37.0 USD
- **Vendor:** Gio's Outdoors
- **Type:** Junction Box
- **Tags:** Gio's Outdoors, Shopify Collective

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 37.00 USD | In stock |

## Images

- Shimano SM-JC40 Di2 External Frame Junction Box 4-Port

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> Source: [Smart supply deals](https://smartsupplydeals.com/products/shimano-sm-jc40-di2-external-frame-junction-box-4-port)
> Updated: 2026-07-22