This is one of the two circlips visible on either side of the crankshaft. They are 19.5mm internal diameter and 2mm thick, fitted to the Bosch Gen 2 motor.

Bosch Generation 2 motor BDU2xx (NOTE: Small chainring)

This is a durable double lip seal, specifically manufactured to fit the Bosch crankshaft. An effective waterproof barrier for the Bosch right-hand crankshaft bearing.
If fitted with the MudStop bearing seal it makes a formidable barrier against water, mud or dust entering into the bearings of your expensive motor. Click here for instructions: 

With seal and MudStop fitted below.

Bosch Generation 2 motor BDU2xx below (NOTE: Small chainring)

MudStop sealing system was designed by VeloLab to ensure better protection for the vulnerable main motor bearing on the Bosch Active and Performance Line / CX motors.

Unlike the Bosch protection seal, MudStop completely covers the entire main motor bearing and outer casing. This stops water and contamination getting past the cover and entering the bearing.

When used with the custom made crankshaft seal, it makes your motor as protected as it always should have been

Full information and instructions can be found here: 

Bosch bearing protection seal (see also “MudStop”)

Bosch Generation 2 motor BDU2xx (NOTE: Small chainring)

This is the damping gasket film that sits between the motor and the frame on a Bosch Gen 2 motor to stop squeaking and creaking.

Bosch Generation 2 motor BDU2xx (NOTE: Small chainring)

New Bosch long life tacky grease for the main motor bearing seal.

Bosch drive unit grease for gears and bearings within the motor. This grease should be used for overhauls or re-greasing Bosch Performance Line motors.

These O-rings sit below the crankshaft bearings to prevent water ingress under the bearing itself.

Fits behind the sprocket nut of the Bosch Gen 2 motor.

Bosch Generation 2 motor BDU2xx (NOTE: Small chainring)

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