Saddle Slang is sponsored by Rehook. Check out our tools, bike care and apparel

dye-too junction box

Di2, Junction, Box

A box that allows for the connection of Shimano Di2 electronic shifting components.

Example usage: 'I need to install a Di2 Junction Box for my new Shimano Di2 drivetrain.'

Most used in: Mountain biking and road cycling.

Most used by: Cyclists who have Shimano Di2 electronic shifting components.

Popularity: 8

Comedy Value: 3

Also see: E-Tube Junction Box, Di2 Internal Junction, SM-EW90 Junction Box, Di2 Junction A,

Understanding the Di2 Junction Box in Cycling

The Di2 Junction Box is an important component for cycling enthusiasts who use Shimano's electronic shifting system. It is a small box that is connected to the handlebars and contains the wiring and connections for the electronic shifting components.

The Di2 Junction Box is typically mounted inside the frame, and it is the connection point for the shifters, derailleurs, batteries, and other components of the electronic shifting system. It is also responsible for controlling the shifting timing and speed, and it can be programmed to provide the optimal shifting performance.

By connecting to the handlebars, the Di2 Junction Box allows riders to shift while out on the road, and it also increases the accuracy of the shifting process. It is a critical part of the Shimano electronic shifting system, and it is estimated that around 70% of professional cyclists use the Di2 system.

The Di2 Junction Box is a reliable and efficient way to shift gears while cycling, and it is an important component of any bike that is equipped with Shimano's electronic shifting system. It is a small but powerful piece of technology that can significantly improve the performance of a cyclist.

Exploring the Origin of the Term 'Di2 Junction Box'

The term 'Di2 Junction Box' is used to refer to the wiring harness in a Shimano electronic bicycle drivetrain. The Di2 Junction Box was first introduced in 2009 with the launch of Shimano's Di2 (Digital Integrated Intelligence) electronic shifting system. This system was first used in the Japanese market and was then released worldwide in 2010.

The Di2 Junction Box is a small control unit that houses the wiring harness for the Di2 system. It is usually mounted on the handlebars or stem of the bicycle and is used to control the shifting mechanism. It is connected to the derailleurs and shifters using wires and plugs, allowing the rider to manually shift the gears without having to physically move the derailleurs.

The term 'Di2 Junction Box' has become a generic term for the wiring harness of any electronic drivetrain, regardless of the manufacturer. It is now widely used by cyclists and bike mechanics to refer to the wiring harness of any electronic drivetrain.

Back to blog

Leave a comment

Please note, comments need to be approved before they are published.

Saddle Slang

Find definitions for all of the technical terms, slang, and acronyms used in cycling. From the different types of bikes and their components, to training techniques, racing terminology and put downs, this dictionary has it all.

Talk the Talk
1 of 3