Bosch Lockring for BDU4XX

The Bosch Lockring for BDU4XX delivers secure, precise chainring mounting with OEM reliability in a clean black finish.

• Official Bosch replacement lockring for BDU4XX mid-drive motors
• Threaded design securely clamps chainring to motor spindle
• High-strength steel construction with corrosion-resistant finish
• Black oxide or anodized coating for durability & stealth look
• Precise torque specs ensure no slippage under heavy e-bike loads
• Compatible with Bosch Performance Line CX Gen4, Gen5 & BDU4XX series
• Includes integrated O-ring seal to prevent contamination
• Easy installation with standard lockring tool (Bosch or ISIS compatible)

You'll love it for its bombproof hold that keeps your chainring locked tight through torque-heavy climbs and trails, OEM fit that restores factory performance, and tough build that handles daily e-MTB abuse without loosening or wear.

Grab yours now and keep your Bosch drivetrain dialed!