The Bosch Service Kit BDU2xx Black is a spare parts kit for the repair of second generation drive units for eliminating damage to the right hand bottom bracket. Bosch Service Kit BDU2xx Black Contents Cover (incl. Seal, bearing, freewheel) Drive gear Gear grease Cover screws Bearing pin with rubber collared bush Protective disc Repair Instructions Only suitable for repairs on bikes outside of warranty Recommended for fitting only by a Bosch approved workshop The drive Unit must not be repaired if any one of the following applies: the drive Unit has one of the part Numbers: 0 275 007 020, 0 275 007 021, 0 275 007 022, 0 275 007 023, 0 275 007 024, 0 275 007 025 or if the bike has a back-pedal brake.