


Key features
- Genuine Bosch replacement lock ring to secure the chainring spider on BDU4XX, BDU37YY, BDU31YY, BDU34YY and BDU38YY mid-drive motors
- Compatible with both Bosch eBike System 2 and Smart System, covering a wide range of Bosch-powered bikes
- Manufacturer reference EB112000JH (EAN 4054289010799) ensures you order the exact correct part first time
- Pair with Bosch O-ring ref. 1270016119 (sold separately) for a complete and reliable replacement
Bosch Lock ring (BDU4XX, BDU37YY, BDU31YY, BDU34YY, BDU38YY)
Genuine Bosch lock ring to keep your chainring securely fixed.
Store availability
Call us to confirm availability before visiting the store

Description
The Bosch lock ring (part no. EB112000JH) is the original fixing ring that secures the chainring or spider to the mid-drive motor unit. Small in size, but essential: without it properly torqued in place, the crankset cannot be safely retained during riding.
It is compatible with a broad range of Bosch mid-drive motors — BDU4XX, BDU37YY, BDU31YY, BDU34YY and BDU38YY — and works across both the Bosch eBike System 2 and the Bosch Smart System. This makes it a versatile replacement part that covers a wide variety of e-bikes currently on the road.
The package contains one lock ring. Please note that a correct installation also requires a Bosch O-ring (ref. 1270016119), which is sold separately. We recommend sourcing both parts before starting the job to avoid any delays mid-repair.
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Contact us by phone at +32 4 290 71 21 or by email at info@kameobikes.com







