Lock ring for mounting Bosch chain ring.
O-ring seal (EP1191) additionally required.
Fits the Bosch electric bike systems.
User’s Manuals for Bosch Electric Bike Motor Systems
Lock ring for mounting the chain ring.
O-ring seal additionally required (not included).
For more information, see the Bosch Performance Line (BDU2XX) User’s Manual for a more detailed look at the Bosch electric bike system.