Bosch Gen 4 Bearing Identifier


identifier bearing guide
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If you are replacing your own bearings, you can find the bearings you require and their respective part numbers from our bearing identifier. These parts can then be found in our shop. If you require any internal motor parts, please contact us.

  • 1Left-hand crankshaft bearing Part No PLB40521
  • 2O-ring left hand crankshaft Part No PLB40532
  • 3Drive gear bearing lower housing Part No PLB40524
  • 4Armature shaft needle bearing, upper housing Part No PLB40526
  • 5O-ring sprocket carrier Part No PLB40530
  • 6Steel drive gear sprag bearing Part No PLB40528
  • 7Right-hand crankshaft bearing Part No PLB40520
  • 8O-ring, lower armature bearing support Part No PLB40529
  • 9Armature support bearing left Part No PLB40523
  • 10Transfer gear shaft needle bearing, lower housing Part No PLB40525
  • 11Drive gear support bearing for right hand motor cover PLB40527
  • 12O-ring gear shaft small Part No PLB 40531
  • 13Motor drive gear support bearing. Part No PLB40522

Quick Links to other Guides

If you are replacing the bearings yourself, you can identify which bearing goes where and individually purchase just the ones you need!

These are all the common bearings in the Bosch ebike Generation 4 Performance CX, Cargo and Speed Line motors.

Bosch Generation 4 (BDU4xx) motor

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