The original Bosch O-ring for the locking ring of drives of the Bosch Performance, Performance CX, Speed and Cargo Line of the 4th generation (model year 2020). This is required when installing a chainring in combination with the matching Bosch circlip.
Because it is an original spare part from Bosch, it is 100% perfectly fitting. This O-ring protects the locking ring against loosening, even when the locking ring is not fitted precisely.
Product compatibility: Performance Line Speed (BDU4XX) Cargo Line / Speed (BDU4XX)