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!
