Shimano Sm-Fd905-H Mount Adapter For Front Derailleur

Shimano XTR Di2 brings the legendary performance of Shimano XTR into the digital world. Shimano's industry-changing Di2 technology uses digitally-controlled servo motors, which are built into the derailleur bodies, to provide clean and accurate shifting with a simple push of a button. All Di2 components are sealed and waterproof, ensuring performance even in the most brutal conditions.

About Di2

While the traditional method of gear shifting uses mechanical control levers that pull and release cables and spring-loaded derailleurs, Di2 is controlled by electronic switches located either in the integrated shift levers and/or at the end of time trial bars. The switches send signals through a wiring harness to a battery pack, placed near the bottom bracket or in the seat tube. The rechargeable lithium-ion battery pack supplies power to the derailleur motors, which move the derailleurs via worm gears. Shimano estimates that their 7.4-volt battery pack can last up to 620 miles per charge. The system also has an LED light to warn when it needs a charge.

The rear derailleur has shift times similar to mechanical systems and a break-away system to protect it in case of a crash. The front derailleur, however, switches gears almost 30% faster than mechanical counterparts. On traditional bikes, the front derailleur is problematic because the chain can be under tension and has to make a large vertical jump between chainrings. The electronic system's controlled motion overcomes these problems. The Di2 system can also trim the front derailleur to eliminate chain rub and calibrate itself to adjust for wear and tear.

About Shimano

Shimano, Inc. is a Japanese multinational manufacturer of cycling components dedicated to supplying high-quality and high-performance components for different types of bicycles made in various countries and regions of the world, ranging from bicycles for the world’s top racers to daily users.

Shimano pursues the creation of new designs and easy-to-use functions by keeping one jump ahead of the users’ imaginations. And they realize innovative new products excelling both in high precision and in durability by the metal-processing technologies they have developed for many years. This, they hope, will encourage more people to use bicycles resulting in the spread of more eco-friendly lifestyles and the promotion of environmental preservation. With this view, Shimano is developing and producing truly “Captivating Products.”