Shimano praises the Di2 for the speed and precision of gear changes and the automatic trimming function of the front derailleur. However, the biggest highlight of the new groupset is the Bluetooth connection. This means that the shifting settings can now be accessed wirelessly via computer, tablet or smartphone - previously, a cable connection with an interface box was required to access the Shimano Di2 E-Tube system. Shimano is also promising an app that can be used to adjust the gears directly on the trail via smartphone.

This wireless data management system, called D-Fly, also allows the rider to retrieve information on battery status or data from compatible other devices such as bike computers. The D-Fly is available as an upgrade for the XTR groupset, but requires an SC-MT800 or SCM9051 system information display and a new battery.

About the battery: identical to the XTR, it should last several hundred kilometers, even under the harshest weather conditions and intensive use. Charging the Di2 battery takes around 90 minutes.

www.shimano.com