Build a Di2 bike

Updated August 27, 2025 by BetterShifting Terry

Want to build a new Di2 bike? What kind of bike? And is it going to be a 12-speed bike, or 11-speed? Is it a mountain bike? Gravel bike? Or perhaps a Time Trial bike?

Simply scroll down to the section that matches your situation, where I've linked to all relevant pages and guides.

Di2 basics

1x12-Speed MTB / Gravel Di2

These bikes are different from other 2x12-speed Di2 bikes. They are fully wireless, with a derailleur-mounted battery. You need a derailleur, the BT-DN320 battery, and a compatible shifter.

2x12-Speed Road / Gravel Di2

This is where you'll find information on 12-speed semi-wireless Di2. The road Dura-Ace, Ultegra, 105 and GRX groupsets fall in this category.

12-Speed Time Trial bikes

Want to build a 12-speed TT bike? The other 2x12-speed guides apply, as well as this one:

11-Speed Di2 / 10-Speed Di2

Want to build an MTB or Road/Gravel bike using 11-speed parts? While these are no longer in production, there's plenty of them on various marketplaces.

I don't recommend building a 10-speed bike, but most of the guides below apply to 10-speed Di2 as well.