You need to use this tool to align the drive gear and set the bearing sprags, so that you can re-fit the gear onto the freewheel sleeve of the Bosch Gen 4 motor.
This is a genuine Bosch lockring tool to remove the castellated nut or threaded chain guard from the front sprocket of a Bosch Classic motor. Cheaper alternative to the genuine Bosch tool
Generation 1 (Gen 1) covers Classic Line and Classic Line +. These motors have a large sprocket and look like the motor here.
This bearing is for the original Bosch “Classic” and has a bespoke internal diameter.
Bosch Generation 1 “Classic”
This is one of the best sealed bearings we could find for this application.
Bosch generation 1 “Classic”
Bearing kit to replace all drive train bearings on the Bosch Gen 1 “Classic”
Bosch Generation 1 “Classic”
Bosch Gen 1 motor drive gear clutch bearing.
Bosch generation 1 “Classic”
This bearing is for the original Bosch “Classic” and has a bespoke internal diameter.
Bosch Generation 1 “Classic”
These high density, sticky backed foam pads are fitted to the Bosch Gen 2 motor to cushion between the motor and frame this can stop the motor creaking as it flexes against the frame mount.
Bosch Generation 2 motor BDU2xx (NOTE: Small chainring below).
This kit contains a stainless steel shield washer and a thinner 1.5mm circlip to replace the original 2mm clip.
The left hand crankshaft bearing should be covered with Bosch Long Life “Tacky” Grease then the shield washer placed over the outer bearing seal. The grease should be checked from time to time, depending on your riding terrain, bike cleaning habits, weather conditions etc.
Generation 2 motor BDU2xx (NOTE: Small chainring shown below)
Bosch Gen 2 Lockring Sprocket Nut Tool PLA00927, this is a lockring tool to remove the castellated nut or threaded chain guard from the front sprocket of a Bosch Gen 2 motor.
Generation 2 (Gen 2) covers Active Line and Performance Line from 2014 to 2018 and Performance Line CX from 2017 to 2019. These motors have a small sprocket and look like the motor shown here.
Bosch Gen 2 main motor bearing tool
This tool will ensure that your new main motor bearing will be fitted without damage. The main motor bearing fitted within the Bosch Gen 2 motor is a large bearing with extremely small ball bearings within it. These ball bearings can be very easily damaged when this bearing is fitted. The main motor bearing tool can be used to press the bearing into the motor cover and then support the bearing while the sprocket carrier/boss is pressed into the bearing.
Bosch Gen 2 main motor bearing with fitting tool
This tool will ensure that your new main motor bearing will be fitted without damage. The main motor bearing fitted within the Bosch Gen 2 motor is a large bearing with extremely small ball bearings within it. These ball bearings can be very easily damaged when this bearing is fitted. The main motor bearing tool can be used to press the bearing into the motor cover and then support the bearing while the sprocket carrier/boss is pressed into the bearing.
If you are overhauling any Bosch Gen 2 motor, this kit contains every circlip used in the motor. These should be replaced to ensure good clip integrity.
Generation 2 motor BDU2xx (NOTE: Small chainring shown below).
Bosch Gen 2 Outer Crankshaft Circlip 2mm PLA00921, these are 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)