Don't worry about getting it wet, but also don't pressure wash your derailleurs. They can take some water but are not completely waterproof. To prevent oxidation, wipe off excess water and dry your Di2 parts using a towel. How do I safely transport my bike? A modern Di2 battery will last between 2000 and 5000 kilometers per charge. This depends a bit on how often you shift and also your shifting style. The front derailleur has to work harder than the rear derailleur and therefore also consumes more energy.

If you go with the bar end junction box, you could also fit a EW-WU111 Di2 D-Fly E-Tube Bluetooth Wireless Unit in the other bar end. It doesn't cost a whole lot more to do and I like it. It's easier to configure your di2 and you can push some info to your head unit, like di2 battery level and gear selection. The kits usually come pre-bled and with an easy connection kit (brake hoses). If you’re buying everything separately don’t forget to include a set of SM-BH90-JK-SSR brake hoses - one for the front brake, and one for the rear. Shimano 105 Di2 R7100 brought electronic shifting to Shimano’s third-tier road groupset level, and importantly for some, it ported over the wireless shifters seen on the latest generation Dura-Ace and Ultegra groupsets.

The Shimano Di2 brand

This means that you’ll have to use the Ultegra or Dura-Ace shift levers. There are no 105 Di2 rim brake shifters. Sometimes people ask me: "is it possible to switch off my Di2?", or: "How do I switch my bike on?". The simple answer is: you don't. When in doubt, choose a slightly longer wire than you think you need. All wires cost roughly the same, and having a wire that is slightly too long is not a problem - excess wire can be hidden in the frame.

This is also the time you confirm every component and wire actually works. Better now than later, after you’ve installed everything on the bike. Installing the components and building the bike While support for optional satellite shifters has been dropped, along with the physical hood-top buttons, the functionality of the electronic system and E-Tube Project app is identical.

The upside of losing these buttons is that two CR1632 batteries need to be installed in each lever, which effectively doubles their battery life from two to four years (although in the interest of bringing you the best 105 Di2 review possible before Shimano replaces the groupset with a new one, I can’t yet verify that claim).