SZZS CEF50 lightweight using Bafang M820 motor (Specifications Thread)

[mike_kelly]

sub-threads
Main conversation -

SZZS specific CEF50-main thread (initial builds and troubleshooting related only)

See the M820 motor discussion for preliminary details...just making a specific CEF50 frame owners topic. Total cost with shipping for me was $1750 US. Production starts this February. So, I put down a $500 deposit for a L-size hoping I don't get burned. 💸😁🍻

www.emtbforums.com

External Batteries Range extenders -

CEF50 Battery Range Extender: that juicebox strapped to your rig to decrease anxiety and extend your range aka fun?

Just doing a CEF50 battery extender solo thread now that frame kits are shipping out. We've got a few CEF50 owners who not only dabble in E-mtb enthusiasm but have got some real pro background into programming and/electronics and possibly some battery pack builders. That's not me but I did...

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Integrated Cable System Headsets -

ICR Headsets for the SZZS-specific CEF50 build

Internal Cable Routing (ICR) headsets come stock/OEM on many higher,-end Orbea E-mtbs in the past few years, so now also this is true for the Bafang M820 (close-integrated downtube battery) frames. Consequently, they're new, and traditional manufacturers like Cane Creek and Chris King are not...

www.emtbforums.com

Gallery of builds

Shenzhen Zhaosheng Carbon CEF50 Gallery of EMTBforums member builds

A gallery of builds by the members of EMTBForums Website: Shenzhen Zhaosheng Carbon Fiber Technology Co., Ltd. - carbon road frame, carbon mtb frame Specifications https://www.emtbforums.com/threads/shenzhen-zhaosheng-carbon-cef50-lightweight-using-bafang-m820-motor-specifications-thread.32613/...

www.emtbforums.com

DIY external range extender

CEF50 External battery build

*************************************************************************************************************************** Update March 2025 When I got my new SZZS 720wh battery it came with the top tube switch which turns the internal battery completely off. My original internal battery could...

www.emtbforums.com

M820 motor tear-down disassembly video.
Be very careful that you don't tear the paper gasket that may stick to both sides of the shell casing. My motor had much more grease that the motor in the video.

Retrofitting external cable guides

Non-ICR headset, internal frame cable guide conversion for the SZZS-specific CEF50

Problems with ICR ZS56/28.6 headsets? Me too! I have two in 8 months with uniquely different issues discussed later. First, all Internal Cable Routing third party headsets are new, and thus questions of precision and durability are at the forefront. Second, I like the idea, it provides a very...

www.emtbforums.com

@voigtkampff "Dropper insert depth on M-size frame is 224mm according to the drawing I got from Jean."

Specifications
Alibaba

Electric Bike Custom Logo Newest Products Light Weight Carbon 29er E-mtb Frame With Bafang M820 740 Wh 410 Wh - Buy Carbon 29er E-mtb Frame newest Products Light Weight Carbon 29er E-mtb Frame carbon 29er E-mtb Frame With Bafang M820 740 Wh 410wh ele

Electric Bike Custom Logo Newest Products Light Weight Carbon 29er E-mtb Frame With Bafang M820 740 Wh 410 Wh - Buy Carbon 29er E-mtb Frame newest Products Light Weight Carbon 29er E-mtb Frame carbon 29er E-mtb Frame With Bafang M820 740 Wh 410wh electric Bike Product on Alibaba.com

www.alibaba.com

Rear Shock hardware 8x22.2mm
Rear Thru axle is 12 x 1.5 x 179
Batteries available
BT FT100.B360 36v 360wg
BT FT014 43v 410WH
Custom ZS BT720 36v 720WH with aluminum or optional carbon case

Chart is website wrong, the headset is a ZS56/28.6 ICR upper and ZS66/40 lower. Suitable for a 1 1/8"-1.5" tapered steerer.
The Bafang M820 motor uses standard ISIS cranks like the Bosch G4 and ones made by Miranda, FSA and Hope.
New version of the rear triangle will soon (2024) be available to support a coil shock and UDH dropout.

There are two versions of the Bafang M820, 36v and 43v and now 48v. You must choose which and get a battery to match the voltage.

Contact Lindalv <[email protected]>
Cost $770+shipping frame with Bafang M820 motor kit $1770+shipping

Discussion thread:

SZZS specific CEF50-main thread (initial builds and troubleshooting related only)

See the M820 motor discussion for preliminary details...just making a specific CEF50 frame owners topic. Total cost with shipping for me was $1750 US. Production starts this February. So, I put down a $500 deposit for a L-size hoping I don't get burned. 💸😁🍻

www.emtbforums.com

Jersey available made by EKOIES Store on Aliexpress.com
https://www.aliexpress.com/store/1101495544?spm=a2g0o.detail.1000007.1.3128115bZkE3CF

message her for the CEF50 Jersey. Long, short, winter summer weight. Asian sizing, so a US XL is a Asian 3XL. etc
About $20 shipped.

Nukeproof headset for CEF50 with good waterseal.

https://www.wiggle.com/us/p/nukeproof-neutron-zs56-headset-int-cable-routed-black-option?utm_source=affiliate-window&utm_medium=affiliates&utm_campaign=Skimlinks&utm_term=Skimlinks&utm_content=Sub+Networks&awc=12444_1686197200_5e66c512a59c97b98ec3d2c0cfba610c

New internal cable routing headset by SZZS

A non-integrated headset from Funn
Upper

Funn Descend Upper Headset

Experience superior durability with our Descend upper headset, machined from aerospace-grade AL6061 and teamed up with angular contact bearings.

funnmtb.com

Lower

Funn Descend Lower Headset

Experience superior durability with our Descend lower headset, machined from aerospace-grade AL6061 and teamed up with angular contact bearings.

funnmtb.com

Display used is canbus. Tested by forum users:
1. DP E180/181

2. DP C244/245.can, only the version 3.0 appears to work with GO+ app.

 

[LAnton]

View attachment 106527Specifications
Alibaba

Electric Bike Custom Logo Newest Products Light Weight Carbon 29er E-mtb Frame With Bafang M820 740 Wh 410 Wh - Buy Carbon 29er E-mtb Frame newest Products Light Weight Carbon 29er E-mtb Frame carbon 29er E-mtb Frame With Bafang M820 740 Wh 410wh ele

Electric Bike Custom Logo Newest Products Light Weight Carbon 29er E-mtb Frame With Bafang M820 740 Wh 410 Wh - Buy Carbon 29er E-mtb Frame newest Products Light Weight Carbon 29er E-mtb Frame carbon 29er E-mtb Frame With Bafang M820 740 Wh 410wh electric Bike Product on Alibaba.com

www.alibaba.com

View attachment 106526
Contact Linda
Cost $770+shipping frame with Bafang M820 motor kit $1770+shipping

View attachment 106528View attachment 106529
View attachment 106531
View attachment 106532
View attachment 106533
Discussion thread:

SZZS specific CEF50-main thread (initial builds and troubleshooting related only)

See the M820 motor discussion for preliminary details...just making a specific CEF50 frame owners topic. Total cost with shipping for me was $1750 US. Production starts this February. So, I put down a $500 deposit for a L-size hoping I don't get burned. 💸😁🍻

www.emtbforums.com

What beautiful photos. Do you know how the wires and cables come out of the frame and go into the rear triangle? You have such photos?

 

[TCFlowClyde]

What beautiful photos. Do you know how the wires and cables come out of the frame and go into the rear triangle? You have such photos?

It looks there are only brake line ports...I believe the set up is for wireless shifting only. I'm using my wireless SRAM AXS GX drivetrain.

The tell was they have a wireless setup in their complete build pics and no chain stay ports for the shifter cable.

But you may want to confirm with Linda that there aren't two frame versions: wireless drivetrain v. traditional wired?'

 

[TCFlowClyde]

Just FYI on another IRC headset option. Here's a more traditional Ritchey that's likely better than stock:

Edited: 12/09/23
Looks like this one can't be used...its IS (integrated bearing system into the frame, no cup with a raised lip) not ZS (with cup) so the top cap probably wouldn't seal over the ZS bearing to be water tight.

If someone is able to somehow adapt it to the newer/smaller 52 mm top bearing CEF50 cup, it would interesting to see how well it works. But even if it did you'd have ream a bigger hole out for the chunkier cable plug.

The upgraded SZZS has got a nice custom display cable port on the top cap already, so would be lots of work on the Ritchey cap to make it functional.

 

[temon10]

Just FYI on another IRC headset option. Here's a more traditional Ritchey that's likely better than stock:
View attachment 106660

bikeinn can trust?

 

[TCFlowClyde]

bikeinn can trust?

Yes. I order frequently...no VAT tax.

 

[mike_kelly]

It looks there are only brake line ports...I believe the set up is for wireless shifting only. I'm using my wireless SRAM AXS GX drivetrain.

The tell was they have a wireless setup in their complete build pics and no chain stay ports for the shifter cable.

But you may want to confirm with Linda that there aren't two frame versions: wireless drivetrain v. traditional wired?'

Top picture looks like it has a chainstay port.
??

 

[TCFlowClyde]

Top picture looks like it has a chainstay port.
??

Maybe but doubtful. Here's a freeze frame shot of a CEF50 stress-test vid Linda sent me.

BTW: Frame in raw carbon looks pretty stout.

 

[mike_kelly]

IN the top picture you can see it on the outside of the driveside chainstay. I don't think wired is dead quite yet.
But it does look stout so cross your fingers.

 

[TCFlowClyde]

IN the top picture you can see it on the outside of the driveside chainstay. I don't think wired is dead quite yet.
But it does look stout so cross your fingers.

I saw it. But it's not. All 5 of my carbon frames have driveside ports dorsal not lateral. It lines up derailleur on top of chainstay with a friction-free path. Plus, the Orbea Wild has no cable ports either...anywhere. Update: the Wild carbon does a derailleur side cable port...but dorsally.

Here's my Enduro analogue I'm currently repairing in the stand.

 

[TCFlowClyde]

I hope not.
It would be a deal breaker for me.

I would confirm with Linda...but I was surprised that none existed as well...you could drill out a small port if none exists. Or ask Linda to have engineers do it, easily?

 

[TCFlowClyde]

If there are open paths to use inside and their is no deadends.

The frame motor mount will have a slot for both the brake hose and speed sensor to feed shifter cable through. Both sides of chain stays should be hollow. Then just drill entry and exist port accordingly.

It should be easy for them to do it...just tell them you want it done prior to their custom painting. They should just make two versions of the chainstay, or at least offer as customized feature.

Logic, that many potential customers will probably want the same traditional cable derailleur setup. Also, now that Shimano has wired electronic shifting powered from the motor only, there would be a new demand.

BTW SRAM has a new motor powered wired version too on some higher-end builds in order to reduce the bulkier battery mounted system....never run out of juice, but I guess no off-powered pedaling either if battery is out as well. (411: just happened to me last week mid-ride in easy gear). Was my fault, they need only monthly charging.

 

[forsa355]

there certainly seems to be a driveside hole on the stay for derailleur cable in the very first picture of this thread. You can also see it very clearly on this picture they sent me of my paint mockup

 

[TCFlowClyde]

there certainly seems to be a driveside hole on the stay for derailleur cable in the very first picture of this thread. You can also see it very clearly on this picture they sent me of my paint mockup
View attachment 107015

To be fair...this is the clearest and best angle pic presented that can be magnified on my cell...sorry no gotcha moment here, if that was also part of your point
Either way good find.

 

[mike_kelly]

Linda sent this image to show a bike with mechanical shifting and cables run just fine.

 

[dvng]

Whats the difference between this frame and the LCE0930?

 

[mike_kelly]

One is made by Zhaosheng Carbon Tech and the other made by Lightcarbon

There are obvious aesthetic differences. I have made spec pages for both so you can compare.
This one is shipping when the Lightcarbon is not, as far as I know at this time.

 

[dvng]

One is made by Zhaosheng Carbon Tech and the other made by Lightcarbon

There are obvious aesthetic differences. I have made spec pages for both so you can compare.
This one is shipping when the Lightcarbon is not, as far as I know at this time.

Possible to identify where are the differences, including the frame dimensions and specs

 

[mike_kelly]

That information is on the first post of each thread.

 

[Txurrispo]

Hi. Thanks for the post.

Do you know if the Fram came with UHD has the same axel?

Regards

 

[mike_kelly]

Hi. Thanks for the post.

Do you know if the Fram came with UHD has the same axel?

Regards

A recent post in the conversation thread tends to indicate they are different but not positive yet

 

[DirtyCurty]

upper

I ordered my frames with the 48v motors and 700wh batteries

 

[El Topo]

Thanks for this great summary, @mike_kelly ! Such stuff should be pinned.


If you still update the first post, maybe mention the new carbon battery (10s3p or 13s2p) and their new carbon cranks in 150, 150, 160, 165 and 170mm.

I think I saw a few posts about a custom battery from @LAnton , maybe also link to those?

Maybe I missed it, but do you mention the rear shock options? Official and what is possible with overstroking and offset bushings.

Also, the new revision will be (is already?) coil compatible, while the first one isn't right? Are there other changes as well? Didn't they also change to UDH?

There are two versions of the Bafang M820, 36v and 43v. You must choose which and get a battery to match the voltage.

Isn't that outdated, and they now also sell an official 48V motor?

Maybe also mention the tools needed to build such a bike for beginners, as well as example part lists?

 

[mike_kelly]

This is just supposed to be a specification thread. So I only want really available things here, not hearsay. I will add the new stuff once it is confirmed to be shipping and someone gets the items in their hands. The optional shock configurations are not supported by the factory. Both Zhaosheng and Lightcarbon do not think they are long term durable. The new revision is reported to support coil shocks and UDH but they is not here yet.
You know building a bike especially an ebike from scratch is not easy. I am not sure it is a service to encourage rank beginners to take such a task on especially because of price. If someone has already built up a few bikes or has a friend to help they probably already know what they need in the way of tools.

 

[DirtyCurty]

Thanks for this great summary, @mike_kelly ! Such stuff should be pinned.


If you still update the first post, maybe mention the new carbon battery (10s3p or 13s2p) and their new carbon cranks in 150, 150, 160, 165 and 170mm.

I think I saw a few posts about a custom battery from @LAnton , maybe also link to those?

Maybe I missed it, but do you mention the rear shock options? Official and what is possible with overstroking and offset bushings.

Also, the new revision will be (is already?) coil compatible, while the first one isn't right? Are there other changes as well? Didn't they also change to UDH?


Isn't that outdated, and they now also sell an official 48V motor?

Maybe also mention the tools needed to build such a bike for beginners, as well as example part lists?

I have 2 frames with 48v coming.

 

[patdam]

One remark about the lack of link between each rear arms wire. This point bothered me before purchase, i was wooried that that bearings fails quickely under the constraits. But after dismantle, i constat that each articulations have 2 bearings side to side, visibly to stiffen and manage the constraits. Not tryed at the moment, I can"t speak about reliability and effiency. But i can say that this choice of conception are surely well thought out if they prefer to instal 2 bearings by axis (more heavy, more complicate to build).

I appreciate less the UDH assembly. It's just machining to adapt the hanger on their previous molding

 

[patdam]

For those who don't want wiring through pivot. We are lucky that SZZS accept to personalize and perform holes on frame to pass the cables (i recommand), but the frame is delivered with original pivot assembly. To have clean finish i have found this ACROS set to replace upper ZS56, but it have an specific bearing assembly and you needs to replace the insert. If soùebody find other solution who allow to use original insert and bearing (only the cover and centering washer), share it.

 

[mike_kelly]

For those who don't want wiring through pivot. We are lucky that SZZS accept to personalize and perform holes on frame to pass the cables (i recommand), but the frame is delivered with original pivot assembly. To have clean finish i have found this ACROS set to replace upper ZS56, but it have an specific bearing assembly and you needs to replace the insert. If soùebody find other solution who allow to use original insert and bearing (only the cover and centering washer), share it.

Cane Creek makes a ZS56 28.6 top assembly but it is unlikely that they use the exact same bearing seat as the SZZS unit.

Cane Creek 40 ZS56/28.6 Complete Headset - Includes Upper and Lower Black

Cane Creek 40 ZS56/28.6 Top Headset Black. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance durability and value the series incorporates all the features necessary for a robust lightweight long-lasting headset. External cups press into...

northwestbicycle.com

 

[voigtkampff]

Dropper insert depth on M-size frame is 224mm according to the drawing I got from Jean.

 

[voigtkampff]

The frame can be supplied with 6-bolt or centerlock speed sensor magnets, both kits cost 6$.