The rear derailleur B-axle bracket unit serves as an attachment point between a traditional derailleur hanger and a Shimano XTR M9000 rear derailleur. The B-Axle link is made to be a sacrificial part in the event of a crash, hopefully bending before the way more expensive derailleur body.
Shimano OEM part
For Shimano XTR M9000 rear derailleurs
40t max cassette
Have Experience With This?
not logged-in log-in to receive an emailed response