Bafang BBS01/B clicking noise when rotating pedals by hand

[Robert Stanford]

Hi,

I have just installed a new BSS01/B from China and the pedals make two clicking noises each revolution they are not at 180 degrees apart and the position moves if I rotate the pedals backwards (suggesting to me that it is not the bottom bracket bearing as it would be in the same spot?).

This is a video of the issue (I think you need to make it full screen to get sound).
https://photos.app.goo.gl/z1e9YTGUD53h83RH8

I also found this thread which seems to be an identical issue
http://www.pedelecs.co.uk/forum/threads/repair-bbs02-bottom-bracket.19842/page-2

Does anyone know what the noise is caused by and how to fix it (if its a problem).

The motor came from China and I can open a dispute with the supplier but it will cost me the carriage.

Thanks in advance for any assistance.

Best regards,

Rob

 

[JPGiant]

Can you confirm if it's from the pedal bearings, or not?

 

[Robert Stanford]

Can you confirm if it's from the pedal bearings, or not?

Hi,

Definitely not the pedals as it happens when you rotate the cranks without touching the pedals.

Rob

 

[Robert Stanford]

Update - I still have to dismantle but spent a few minutes investigating further:

There is no play as far as I can tell in the bottom bracket and the bearings seem to be smooth when I rotate it in forward and reverse.

Turning the chainring so it drives the motor does not result in any clicking.

I think that there may be clicking when I turn the chain ring in the other direction i.e. the same way as pedaling but its hard to turn it consistently to be 100% sure.

There seems to be more lateral play (side to side) in the chainring than I would have expected. when I do this I get a noise not dissimilar to the clicking from pedaling.

 

[Robert Stanford]

I took the cover off this afternoon and the click is definitely associated with the gear wheel that drives the chainring (crown gear?). I can't be sure but it sounds like its originating from where it meshes with the nylon gear from the motor.

The two do not mesh as closely as I was expecting but having checked a couple of videos for other models it seems that they may be the same.

This is a video of my BSS01/B

https://photos.app.goo.gl/DPNX392GYuWZeW719

I'd be grateful if anyone can can tell me if this is typical or not?

Best regards,

Rob

 

[Fordulike]

I took the cover off this afternoon and the click is definitely associated with the gear wheel that drives the chainring (crown gear?). I can't be sure but it sounds like its originating from where it meshes with the nylon gear from the motor.

The two do not mesh as closely as I was expecting but having checked a couple of videos for other models it seems that they may be the same.

This is a video of my BSS01/B

https://photos.app.goo.gl/DPNX392GYuWZeW719

I'd be grateful if anyone can can tell me if this is typical or not?

Best regards,

Rob

Mine clicks every time I stop pedalling under power, but I know this originates from the one way bearing pawls. My click may not be related to your problem, but I would just ride the bike and if the noise doesn't bother you, don't worry

 

[Robert Stanford]

Mine clicks every time I stop pedalling under power, but I know this originates from the one way bearing pawls. My click may not be related to your problem, but I would just ride the bike and if the noise doesn't bother you, don't worry

Thanks, I don't have a problem with the click, my worry is that it may be a sign of a fault that could deteriorate. I want to use the bike for long distance cycle touring so reliability is high on my list. One of the reasons for choosing the BSS01 was that if it does break I can swap it out for a new motor and carry on with little effort or even revert back to a standard bike.

 

[Trevor George]

the pedals make two clicking noises each revolution they are not at 180 degrees apart and the position moves if I rotate the pedals backwards.

Hi @Robert Stanford . . that sounds just like mine . . HERE

I made a post about it HERE
But I'm still waiting for a reply from the Bafang tech guys.