BB Shaft Replacement


Getting ready

It is advised to wear suitable protective personal equipment (PPE) and be in safe working environment. Before starting this maintenance process, below tasks must be completed:

  • Disconnect the battery / power supply

Tools required

Circlip PlierNWS 175-42-A21 Circlip pliers angled for external circlips, 165.0 mm 
Allen Key

Parts required

You will need to prepare the listed parts for this maintenance procedure.

Replacement BB Shaft
x 1 unit

Steps to follow

Step 1 Crank Removal

For this step, Kindly refer the crank removal procedure by clicking the link below.

Crank Removal


Step 2 Kickstand Removal

For this step, Kindly refer the kickstand removal procedure by clicking the link below.

Kickstand Removal


Step 3 Housing Removal

For this step, Kindly refer the housing removal procedure by clicking the link below.

Housing Removal


Step 4 Gearbox Module Cover Removal

For this step, Kindly refer the gearbox module cover removal procedure by clicking the link below.

Gearbox Module Cover Removal


Step 5 Removing old BB Shaft

5.1

Using a circlip plier, remove the 35mm circlip on the Driver Sprocket. 
5.2

Once the circlip is removed, gently slide out the BB Shaft on the other side.

Rest the Driver Sprocket & chain on the Gearbox.

Step 6 Installing new Rear Spur Gear

6.1

Collect the replacement unit of BB Shaft and start aligning it into its designated hole.
6.2

Continue to install the BB Shaft until it is fully flushed. 

Make sure that all gear teeth are meshed perfectly with the teeth on the idler gear.
6.3

On the other side of the bike, insert the Driver Sprocket back into the new BB Shaft.

Ensure that the sprocket is installed until its fully flushed, indicated by a visible groove for 35mm circlip.
6.4

Re-install the 35mm circlip into its designated groove to
 
secure the BB Shaft with the sprocket.
6.5

Visually inspect the installed sprocket and ensure that all gear teeth are hooked perfectly.

Step 7 Re-installing Gearbox Module Cover

For this step, Kindly refer the gearbox module cover installation by clicking the link below.

Gearbox Module Cover Installation


Step 8 Testing new BB Shaft

8.1

Finally, twist the throttle or rotate the crank.

Make sure that the BB Shaft is rotating smoothly without any further issue.
 

Step 9 Re-installing Housing

For this step, Kindly refer the Housing installation by clicking the link below.

Housing Installation


Step 10 Re-installing Kickstand

For this step, Kindly refer the Kickstand installation by clicking the link below.

Kickstand Installation


Step 11 Re-installing Crank

For this step, Kindly refer the Crank installation by clicking the link below.

Crank Installation


End of Article

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