Bafang M820 CEF50 carbon frame maintenance/repairs/replacement parts thread

hamncheez

Member
Mar 9, 2021
28
6
USA
First off, I love my CEF50:
View attachment CEF50-carbon.jpg
Of course this frame isn't perfect, headset routing sucks, I had to dremel a pit in the carbon to allow for the Cane Creek to fit, etc. However, the entire build including frame, motor, and battery is about $3k for me so thats not too bad, especially for a total build weight of exactly 42 pounds.

Anyways, with the other m820 and CEF50 threads getting over a hundred pages long, I thought I'd start a new one SPECIFICALLY FOR MAINTENANCE, REPAIRS, AND REPLACEMENT PARTS for this frame.

If you spend hours reading the other threads, there are several recurring problems the CEF50 has. They are:

  • Headset creaking
  • Bolts coming loose
  • Cracking near the Horst link (rear) pivot on the chainstay, drive side
I've only encountered the first two. Anything else to be added?
 

hamncheez

Member
Mar 9, 2021
28
6
USA
Personally, I've had several bolts come loose- the motor mounts and the driveside rear chainstay pivot, which I lost this morning. Anyone know of how to get a replacement?

Don't neglect your thread locker!

1714580042629.png
 

calvintys

Active member
Sep 12, 2023
246
246
Malaysia
My m820 has a funny problem, just wonder if any encounter this before.

 

un..inc

Active member
Jun 13, 2023
127
107
Germany
I secured every bolt with threadlocker during buildup, and this is relatively secure...
The problem is: i destroyed the mounting-bolts for the shop...
Does someone have the exact measurements of those bolts?
Thanks!
 

calvintys

Active member
Sep 12, 2023
246
246
Malaysia
I secured every bolt with threadlocker during buildup, and this is relatively secure...
The problem is: i destroyed the mounting-bolts for the shop...
Does someone have the exact measurements of those bolts?
Thanks!
Which bolts are you referring? Pic will be great
 

un..inc

Active member
Jun 13, 2023
127
107
Germany
Which bolts are you referring? Pic will be great
Sure:
1727784623875.png

And in the meantime, I can see, why it was not obvious... I meant the bolts for the SHOCK - which should be clear - but I wrote the bolts for the SHOP... :D
Sorry for that... ;)

Thank you all!
 

calvintys

Active member
Sep 12, 2023
246
246
Malaysia
Sure:
View attachment 147574
And in the meantime, I can see, why it was not obvious... I meant the bolts for the SHOCK - which should be clear - but I wrote the bolts for the SHOP... :D
Sorry for that... ;)

Thank you all!
Contact Jean, she will sell you those shock bolts, if u lost the male bolts , just use your water bottle bolts, i lost my in trail and use water bottle until Jean send me a new bolt, it around 10usd. It's custom size , i try Google it but no luck.

Screenshot_20241001_204416_WhatsApp.jpg Screenshot_20241001_204412_WhatsApp.jpg Screenshot_20241001_204409_WhatsApp.jpg Screenshot_20241001_204405_WhatsApp.jpg
 
Last edited:

un..inc

Active member
Jun 13, 2023
127
107
Germany
Contact Jean, she will sell you those shock bolts, if u lost the male bolts , just use your water bottle bolts, i lost my in trail and use water bottle until Jean send me a new bolt, it around 10usd
Thanks, I will contact her, but I fear, that the next bolts will be soft aluminium as well.
I would like to get bolts in titanium or steel...
 

un..inc

Active member
Jun 13, 2023
127
107
Germany
Thank you!
BTW: I did not lose a part - I broke the Hex inside the bolt head...
So I will have to break it, to get it out...
 

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