How to choose electronic shifting spares
Electronic groupsets need the right small parts to keep shifting reliably. Here's what you'll find in this range.
Junction boxes
Shimano Di2 junctions connect cables, and some include the charging port and system controls.
Wireless units
A Di2 wireless unit connects your system to the Shimano E-Tube app and compatible bike computers.
Batteries and covers
SRAM AXS battery blocks and covers keep the derailleur powered and sealed.
Remote buttons
SRAM AXS Blips add extra shift buttons on aero bars or tops for faster shifting.
Mounts and holders
Seatpost battery holders secure internal Di2 batteries so they don't rattle.
Match your system
Shimano Di2 and SRAM AXS parts aren't interchangeable. Check model and generation.
Also see shifting batteries, battery chargers, electronic cables and grommets.