🚴♂️ Shift into the future with Shimano's Ultegra Di2!
The SHIMANO Ultegra Di2 Internal Routing Junction Box is engineered for 2x10 crankset compatibility, offering a sleek internal routing design that enhances both performance and aesthetics. Weighing minimally, it ensures that your bike remains lightweight while providing seamless integration with Shimano Ultegra Di2 components.
| Item Package Dimensions L x W x H | 4.4 x 2.2 x 1.3 inches |
| Package Weight | 13.61 g |
| Item Dimensions LxWxH | 3 x 4 x 2 inches |
| Brand Name | SHIMANO |
| Color | One Color |
| Number of Items | 1 |
| Manufacturer | Shimano |
| Part Number | SH4255 |
| Model Year | 2012 |
| Size | Internal/SM-JC41 |
| Sport Type | Cycling |
C**S
expensive but functional
It is an expensive item for its size but essential to install Di2
F**R
A necessary part for Di2
Not much to say about this junction box. It’s a necessary part for installs. This allows you to easily stuff it in the seat tube or down tube to conceal it. I added foam insulation around the ends to make it quieter inside the tubes.
H**X
Internal wiring junction box - picture is wrong
If you are going to run your Di2 cables inside the frame tues, this is the part you want. The picture is of the external mount box, but the internal box is the one I received. Just remove your crank, plug in your 4 wires, tuck this back into the frame tube, reinstall the protector sleeve and crank and you are all set. A very clean install of shifting perfection!!
G**N
It's Shimano...
Once you go Di2, you don't want to go back, although I'm waiting to see if Shimano follows suit with Scram and goes wireless. They also need to focus on mountain bikes as well when releasing new products and not just keep us waiting while supplying the road bike scene.
T**K
Genuine Shimano
Works great
Trustpilot
1 day ago
2 weeks ago
