Di2 is a term that refers to Shimano's electronic shifting system, which offers an alternative to the traditional mechanical shifting commonly found on bicycles. Di2 stands for "Digital Integrated Intelligence," and it utilizes electronic components to control gear shifting on a bicycle.
In the Di2 system, a series of sensors and electronic wires are integrated into the bicycle's drivetrain. These sensors detect the position and movement of the chain and communicate with the control unit, which processes the information and sends commands to the front and rear derailleurs.
The electronic shifting provided by Di2 offers several advantages over mechanical shifting. It provides precise, reliable, and effortless gear changes, enhancing the overall performance and ride experience. Additionally, Di2 allows customization of shift buttons' positions and the ability to programmatically adjust the shifting speed, which further improves ergonomics and ease of use.
The Di2 system employs a rechargeable battery, typically mounted on the bicycle frame, to power the electronic components. The battery can be easily charged via a charging port, and its level can be monitored through indicator lights or connected devices.
Di2 is compatible with different types of bicycles, including road bikes, mountain bikes, and time trial bikes. It is considered a high-end technology in the cycling world, favored by professional riders and enthusiasts seeking advanced shifting capabilities and performance.