Early Brose C, T, TF motors had no seal covering the right hand crankshaft bearing. This seal is extremely effective at stopping water and dirt entering the bearing and ultimately the motor.

This is also a direct replacement if your Brose S or S-Mag seal is missing, worn or damaged. (For 1.2, 1.3, 2.1 and 2.2 motors)

Once the seal has been fitted over the sprocket carrier it will be pushed down when the chainring spider is re-fitted.

This gasket will fit Brose S-Mag 2.1 & 2.2 and fits between the motor and the drive belt cover.

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)

Bosch Active Line, Active Line Plus and Performance Line Gen 3 BDU3xx Armature support bearing left hand side.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Bosch Active Line, Active Line Plus and Performance Line Gen 3 BDU3xx Armature support bearing right hand side.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Bosch green “tacky” seal grease and bearing cover for the right hand crankshaft bearing on early Gen 3 motors: Active Line, Active Line Plus and Performance Line motors. Suitable for all BDU3XX drive units up to serial number 859302XXX

Bosch green “tacky” seal grease and bearing cover for the right hand crankshaft bearing on early Gen 3 motors: Active Line, Active Line Plus and Performance Line motors. Suitable for all BDU3XX drive units from serial number 860011XX

Small O-ring to fit the left hand side of the Bosch Gen 3 crankshaft.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Bosch Active Line, Active Line Plus and Performance Line Gen 3 BDU3xx Freewheel clutch bearing, fits into the large drive gear.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Bosch Gen 3 left hand crankshaft bearing fits in the left hand motor cover and supports the crankshaft.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Kit to replace all the bearings in the Bosch Gen 3 motor. This kit will fit the Active Line, Active Line Plus and Performance Line motor (There is no Gen 3 Performance Line CX)

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Bosch Gen 3 Right hand crankshaft bearing fits in the right hand motor cover and supports the sprocket carrier and crankshaft.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

Large O-ring to fit the right hand side of the Bosch Gen 3 crankshaft sprocket carrier.

Bosch Generation 3 motor BDU3xx (NOTE: Large chainring)

This bearing supports the electric motor armature and fits into the left hand motor cover (non drive side).

Bosch Generation 4 BDU4xx

Please see bearing identifier for bearing position.

Bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

Please see bearing identifier for bearing position.

Bearing will fit the Gen 4 Performance Line CX, Cargo and Speed motors.

Bosch Generation 4 motor BDU4xx.

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