The new GRX RX827 long-cage derailleur brings full wireless 1x-12 shifting to gravel bikes.
It features built-in Automatic Impact Recovery, an impact-deflecting shape, and simple covered-pulley solutions. The derailleur stands up to harsh trail impacts and still retains its lightning-quick shifting speed and top-level performance.
The derailleur is 1x-only, and not compatible with any 2x12 Di2. It only works with the BT-DN320 battery, which is held in place inside the derailleur. The battery is taken off the derailleur for charging.
All 12-speed wireless road / gravel shfiters are compatible, as well as the 12-speed MTB shifters.
RD Protection Function: The new Automatic Impact Recovery function instantly returns the derailleur to its original position after impact. Protected Battery: Tucked safely inside an enclosed space, the battery won’t budge even in rough terrain, while remaining completely removable for charging.
Charging these batteries is easy - you take out the battery, pop it in the charger, and that's it. After about an hour the battery will be fully charged, and you're good to go.
What is a rear derailleur's total capacity, really? Why is there a top sprocket minimum? And what about front derailleurs? Chain line, total capacity, Top gear teeth? This page explains all of those, and more.
Pairing 1x12 fully wireless Di2 MTB shifters and derailleurs can be done in two different ways. With the Shimano mobile app, and without.
