CEF50 E-MTB with Bafang M820 System - Initial Impressions

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One of the lighter weight E-mtb models to grace the DIY frameset market. Shenzhen Zhaosheng's CEF50 Frameset equipped with the Bafang M820 system with 75NM of torque promises to bring the capabilities associated with premium/high quality performance but at a much more realistic & affordable price point.
With up-to-date geometry and in 4 frame sizes (Small, Medium, Large & X-large), will this DIY E-mtb become a new favourite within the DIY frameset marketspace in 2024?🤔
A full carbon frame with a 410wh battery (or 720wh if you're range conscious), this bike blurs the lines between an effective workout tool, trail ripping power hour machine & absolute hill climbing champion.
Keep a watchful eye on upcoming content, as 2024 maybe the 'year of the DIY E-mtb builder'👊🏿
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Special Thanks to GT-CYCLES Store for the frameset hook up. Please visit the GT-CYCLES Store @ a.aliexpress.c...
Special Thanks to Changzou Feildebikes for the Bafang M820 hook up. Please visit Changzou Feildebikes Store @ x.alibaba.com/...
Special Thanks to Merlin Cycles for the build kit hook up. Please visit Merlin Cycles @ www.merlincycl...
For more E-mtb frameset options, please check out the Dengfu Frame Ebike Owners Group & EMTB Frameset Kit Group on Facebook @
1. Dengfu Frame Ebike Owners Group - www.facebook.c...
2. EMTB Frameset Kit Group - m.facebook.com...
Visit GBK (Green Bike Kit) for all your Bafang motor requirements, spares and accessories @ www.greenbikek...
Visit Carbon Cycle on ebay.uk for Dengfu E10, E22, E55 and more @ ebay.co.uk/usr...
Visit the Bafang M820-CEF50 Frame (lightweight) Thread on EMTB Forums @ www.emtbforums...
#bafang #emtb

Опубликовано:

28 сен 2024

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Комментарии : 94

@antn8387 4 месяца назад

Wow, the Bafang GUI is actually really useful.

@childishantiks7278 10 месяцев назад

This ebike reminds me of a Trek ebike. It does like nice. But 600w of peak power compared to the other Bafang motors and frames is a bit weak imo. Good video Neeko👍🏽

@neekodevinchi 10 месяцев назад

Lol. You wouldn't be the first person to say that the CEF50 reminds them of a Trek 😄. I appreciate that some riders prefer 'absolute power' when considering ebike systems. So I'll make sure to balance all the different frameset options available in 2024👍🏿

@ElevatedVehicles 9 месяцев назад

600w is low compared to the others but it weighs less too which is nice

@Thephonkgod 6 месяцев назад

This motor is not meant to be “full power”. It’s a light weight assistant motor. You can have a really nice EMTB that only weighs 20kgs.

@stuartcareless9550 10 месяцев назад

That's Brilliant whats the build cost, Do you prefer the dengfu? GREAT VIDEO 👍 Being able to remove the battery for winter storage is nice.

@neekodevinchi 10 месяцев назад

My CEF50 with its current build cost me roughly £2900 (maybe a bit less, I'll need to relook over all my receipts). Difficult to say whether I prefer Dengfu or CEF. I'll share my experiences and opinions once I've built up the Dengfu E69 (which uses the same system). I guess you could remove the battery for seasonal storage. But I'm testing the M820 system in -2° temperature. So far, the battery and motor doesn't seem as troubled by the low temperature in terms of performance. The range has slightly decreased. But that's to be expected, given the cold weather I'm having👍🏿

@stuartcareless9550 10 месяцев назад

@@neekodevinchi Thank you for you reply I think it shows how much we all value your opinions on these bikes.

@DavidSmith-wy5js 10 месяцев назад

nice one Neeko , keep em coming.

@neekodevinchi 10 месяцев назад

Will do David. The Dengfu E69 may have some competition🤫

@TheBrokenMountainBiker 10 месяцев назад

Just found your channel, you have some really interesting builds here.

@neekodevinchi 10 месяцев назад

Thanks dude. Be sure to keep a watchful eye, as more frameset builds are coming (some using motors like Shimano, Bosch etc)👍🏿

@dannydelgada7961 9 месяцев назад

I like the part where you showed the motor power. Thx👍

@AlexOdjas 10 месяцев назад

Hi Neeko, cool video👍 If you had to keep only one bike, which one would you keep: this one on the M820 or the E55 on the Bafang Ultra? And why do you think so? Your opinion is very interesting.

@neekodevinchi 10 месяцев назад

Good question🤔 Truth be told, I would look at the E55 and CEF50 similar to a Levo and Levo SL. Both (in terms of geometry and travel) are capable in their own right. But would boil down to circumstances, instead of terrain. E.g. The CEF50 makes for a brilliant 'power hour' emtb, due to being light/nimble and having a sufficient battery capacity to keep you going for a afternoon or morning rio. Whereas the E55 is a great 'long distance Allmountain' emtb, due to its powerful motor and high capacity battery. So for me, both would be useful. It just depends on the circumstance👍🏿

@wrosslandwr8032 9 месяцев назад

Would like to see a hill climb stock Bafang bbshd vs Bafang ultraG510/620)

@neekodevinchi 9 месяцев назад

I can look into that. Just need to find a good frame for the BBSHD👍🏿

@rubanghostday7227 10 месяцев назад

Neeko, will you compare the M820 to the Bosch sx motor? I'd love to see that comparison👍🏽

@neekodevinchi 10 месяцев назад

I can do that👍🏿

@jackthomas23 4 месяца назад

Great review

@wesleycollins8447 10 месяцев назад

Nice ebike Neeko👍

@pierredeslandes9896 26 дней назад

Is that the sound of the motor rattling @20 seconds ???

@neekodevinchi 26 дней назад

No. That's the sound of the motor in the highest level of assist, achieving peak output👍🏿

@garth62 Месяц назад

I have a Trek Rail. I'm curiuos as to how you would compare this motor to a Bosch Full Fat emtb. ( I bever use Turbo - never needed ) so wondering if a lighter ebike like this would suit me better? ( I don't like the closed system with Bosch and would also like to be able to carry out motor maintenance myself)

@neekodevinchi Месяц назад

Hi there, I've just swung a leg over my Whyte E150 which uses the Bosch Gen4. I'm not too sure which model of Trek Rail you own. Bit my Whyte E150 xl with fox 36 and float X weights near 26kg. The first difference I notice from coming off my CEF50, is how reliant I am on the Bosch Gen4 motor. I don't use Turbo Mode much. But I will gladly say that Tour+ & EMTB Mode are used very often. And I wouldn't want to ride my Whyte with no battery. Unlike my CEF50, where I'm not as reliant on the M820. But (if required) it can still pump out a surprising amount of power to climb technical terrain. I do find myself using the CEF50 as my primary trail emtb. But I am finding that my needs (especially a trail/Allmountain emtb) to be specific. Unlike an Enduro emtb, where I'd be more inclined to have as much power and travel. And would be willing to incur a weight penalty. Yes. Bafang motors (by reputation), are known and proven to be serviceable. And parts are available. But Bafang have invested in service centers. And you'll be hearing about this very soon. But to answer your question. If you like the Bosch Gen4 and want similar characteristics (motor over-run etc) with less weight, you have the Bosch SX or the Bafang M820. But as you say, Bafang isn't a closed system. So using third party batteries & displays is a noteworthy consideration. I have made a video comparing the CEF50 to the Specialized Levo, so feel free to give that a watch. Failing that, I hope the above has answered your question👍🏿

@damianhla 7 месяцев назад

Thanks for the nice review. With the chain the Shimano 12 speed chain is too weak for ebike. Mine snapped 3x times in the first few months i had my Trek Rail 7. I swapped my Shimano chain out and put in a KMC e12 that is specifically build for ebike. Never had any issue since 😂👍

@neekodevinchi 7 месяцев назад

Good advice. I'll look into the KMC chains👍🏿

@YongPark-g3h 5 месяцев назад

Consider going to 10 speed or 11 speed. Cassettes and chains are beefier and cheaper. With motor assist, even 10 speed is enough (for me)

@damianhla 5 месяцев назад

@@YongPark-g3h Very true. I did consider the 10 or 11 speed option. 12 speed is just not very suited for high torque application.

@СашаПетров.Жизнь 8 месяцев назад

bafang sounds like a dental drilling machine))

@neekodevinchi 8 месяцев назад

Lol. The motor's can be heard in the higher levels of assist👍🏿

@ryanrodriguez1234 5 месяцев назад

Any fully built light or super light e-mtb's you recommend that are more affordable then the common name brands? Appreciate any advice you can give!

@neekodevinchi 5 месяцев назад

Sincere apologies for the delay. I should have a better understanding of more Superlight / mid-assist emtbs (around & under £3000 / $3800 / €3500) in May. I'll happily spread the word and share my findings then👍🏿

@ryanrodriguez1234 5 месяцев назад

@@neekodevinchi All good man, appreciate the work your putting into the content, good stuff!

@denizdurmus4440 5 месяцев назад

Hey Neeko, as you are a tall big guy, how do you setup the rear shock on the cef50? The ratio of the frame is very high at 3:1? Would you mind to state your weight and preasure to achive about 25% sag? Do you know anything about weight limitation? Cheers!

@neekodevinchi 5 месяцев назад

With the Fox Float X rear shock, I'm running the 2nd from biggest volume spacer and 265psi. This gives me about 30% sag. The float X has a medium tune. It's been a while since I've weighted myself but I tend to set up my suspension fully kitted (wearing a backpack with spare tools and a tube etc). But I wouldn't classify myself as a light rider, as I'm fairly broad. The bike is supple at the beginning of it's stroke but ramps up within the mid stroke. So it's fairly supportive with minimal pedal-bob. The bike's is fairly progressive for a trail/Allmountain emtb. The weight of the bike allows it to pop off the ground fairly easily without to much speed. But the bike still feels calm and consistent when blasting down a steep rock garden. I haven't tried the CEF50 with a coil shock. But I'll definitely say that setup isn't difficult and can easily accommodate riders of different sizes and weights👍🏿

@gorillachanmtb8057 8 месяцев назад

what travel fork have you used? The geometry table shows 170mm fork = 64 degree head angle

@neekodevinchi 8 месяцев назад

160mm travel Fox 36. Yes, you can use a 170mm travel fork as well. Personally, I'd go mullet setup if you choose to use a 170mm travel fork. Otherwise, the bb height may be a bit low👍🏿

@garymartin557 7 месяцев назад

just came across your channel. just subscribed.

@neekodevinchi 7 месяцев назад

You're very kind👍🏿

@garymartin557 7 месяцев назад

@@neekodevinchi did you tune the motor, or did you use it as supplied. could i ask if it is in EU or US spec?

@neekodevinchi 7 месяцев назад

The M820 came with the newest firmware and with the provisions to connect to the Bafang Go+ app. Its set to EU speed limit (15.5mph). I do have the besst tool. But I haven't had a need to change or amend anything👍🏿

@garymartin557 7 месяцев назад

@@neekodevinchi thank you for you swift reply. this is something i could be interested in but in a lower spec form and the larger 720w battery.

@samcollins-vq4hu 9 месяцев назад

Have you tried over-stroking the cef50 with a 210x60 shock or 216x63? Love to know if it's possible👍🏻

@neekodevinchi 9 месяцев назад

Good question. I'll give it a bash and see if it's possible and share my findings👍🏿

@garymartin557 3 месяца назад

Could i ask you how tall you are as you stated it is in size XL. Many thanks Gary.

@neekodevinchi 3 месяца назад

Hi Gary, I'm 6foot 3inches. The bike fits me really well. Hope this helps👍🏿

@garymartin557 3 месяца назад

Thanks, I'm 6ft I your opinion would L or XL suit better? Wanting a 29er trail bike with 140_150mm travel.

@neekodevinchi 3 месяца назад

Apologies for the delay. You're in between both the large and XL. You could go for the large and run 160mm travel fork with 29er front and rear. Alternatively, you could go XL with 170mm travel fork and mullet. I appreciate you want a 140mm travel ebike. But I suspect you'll prefer the CEF50 in either its 160/150 29er Configuration. Or 170/150 Mullet Configuration👍🏿

@garymartin557 3 месяца назад

@@neekodevinchi many thanks for your attention and advice.

@endikaarizmendiarrieta2760 3 месяца назад

Se puede montar un M600 o M620 en este cuadro?

@neekodevinchi 3 месяца назад

No. Este marco solo puede soportar el motor y el sistema bafang M820. El fabricante que fabrica este marco ha fabricado otros marcos que admiten M600/M510/M560 o M620/M630. Espero que esto ayude👍🏿

@richarddevey2449 5 месяцев назад

hi mate love the info i’m tempted to purchase, does the frame come with no decals?

@neekodevinchi 5 месяцев назад

Yes. You can order the frame in a matt black finish without decals cheaper than a painted frame👍🏿

@richarddevey2449 5 месяцев назад

@@neekodevinchicheers

@jasonmvosper3758 Месяц назад

Great video. What frame size did you buy? Are you happy with fit, you look quite tall? Would you want smaller or larger?

@neekodevinchi Месяц назад

This is an XL. I'm 6foot 3inches. It fits perfectly. No complaints👍🏿

@konannanok4961 7 месяцев назад

Is there any drag when you do not use engine assist ?? Can you even do it, just turn off assist and pedal on your own and turn on assist when terrain gets challenging ??

@neekodevinchi 7 месяцев назад

The M820 is Bafang's best emtb motor they've built which offers next to little drag (over the speed cut-off and without power). It is possible to ride without assist if you run out of battery. But I haven't tried 'deliberately' climbing up something steep with the motor off. So I'll give that a bash this weekend and make a RU-vid Short👍🏿

@konannanok4961 7 месяцев назад

@@neekodevinchi thanks, I'm just torn between old good analog bike which requires from you all your effort to get from point A to B. There are some uphills say 20% gradient which i can't do on my analog bike, and if I try my HR spikes to 185 - which isn't necessary good. I'd like to make it more effortless to climb it and use assist fr it. Not really a fan of full power e bikes as i want to get myself sweat and do all day long trips (100km+ on my MTB) which really does not require too much help from motor. Just somee help from time to time on ECO mode . My ideal E-bike for now would be lightwight model with M820 Bafank and 400Wh battery - 18kg would be good as this is my current FR machine I'm riding. Not really meant for this kind of activity but who cares. Is super plush and makes you sweat after all day long ride.

@neekodevinchi 7 месяцев назад

I see what you mean. Truth be told, the CEF50 nowadays is one of my "goto" ebikes. Its near enough used as a training tool. And a very effective one, as it allows me to transition back to using a regular bike more seamlessly. Don't get me wrong, you feel the power if you put the CEF50 in the highest level of assist. But thats used more for riding with others who use full-fat ebikes. But this bike will be very useful to allow me to transition/whine off full-fat ebikes to regular bikes and vice versa👍🏿

@killerbearkumar3527 9 месяцев назад

Does the M820 motor use uart? Great video.

@neekodevinchi 9 месяцев назад

It's CANBus only👍🏿

@timd9117 9 месяцев назад

Were there any problems with the frame? Did a service need to be done?

@neekodevinchi 9 месяцев назад

No problems or issues with the frame, motor, battery, display etc. Again, all I've done is use insolation foam around the battery to prevent cable rattle. 600miles and growing. The bike is awesome and I have no regrets👍🏿

@timd9117 8 месяцев назад

@@neekodevinchi cool! Many thanks! 🙌

@СашаПетров.Жизнь 8 месяцев назад

хороший канал про китайские электровелосипеды . Хочу продать свой турбо лево и купить велик на бафанге

@neekodevinchi 8 месяцев назад

Keep a watchful eye on upcoming content. I'll be covering more frames which use Bafang, Shimano, Bosch etc👍🏿

@СашаПетров.Жизнь 8 месяцев назад

@@neekodevinchi ок))

@jaywhittemore5878 8 месяцев назад

I also bought the cef50 frame. It was incredibly similar to my Transition repeater which I love but did not have nor want to paid $9000 usd again.

@neekodevinchi 8 месяцев назад

Good to know. Thanks for sharing👍🏿

@shawncarter2006 Месяц назад

Is there a way to turn off background salsa music 😂😂 good review!!

@jaywhittemore5878 7 месяцев назад

My cef50 came out awesome

@Okawa777 3 месяца назад

Topspeed ?

@neekodevinchi 3 месяца назад

I've got mine set to 15.5mph. However, it can be unlocked via Besst Pro to 60kph. Hope that answers your question👍🏿

@jadeethan 10 месяцев назад

Yes the review we been waiting for! Exciting! Ty!

@neekodevinchi 10 месяцев назад

Much appreciated for being the first person to comment. If you have any questions, please don't hesitate to ask👍🏿

@DaxLo-wr7ch 6 месяцев назад

Great video and appreciate the insight of the motor power and noise. Will you be buying and reviewing other m820 ebikes?

@neekodevinchi 6 месяцев назад

Yes. Two further frames will be featured on the channel👍🏿

@nazeemditto3421 9 месяцев назад

Will you be testing the 720wh battery Neeko? Would be useful to know which battery to use for the M820 & cef50👍🏽

@neekodevinchi 9 месяцев назад

For sure. I'll leave no stone unturned to fully understand the M820 system👍🏿

@AkizaIzinski-ch7mp 5 месяцев назад

Hi Neeko. Big fan. I've spoken with some sellers of the cef50 frame and bafang m820 motor and I think can get a frame motor battery charger headset axle display and cranks for less than $2500 inclusive shipping and tax. Before I pull the trigger and buy the frameset, I have a couple of questions. 1. you're using the official battery from Bafang but the seller only sells the 48v battery. Will this make the bike heavier and would I be able to check on the battery health using the display and app? 2. I know you open, service and repair bafang motors. have you found ways of making it less noisy? 3. how reliable is the motor? I don't mind repairing and servicing parts. But i'd rather not do this more than I need too. 4. I have seen other frames available which use the M820 motor but i can't find any reviews. Are these other frames better than the cef50? and 5. I know your cef50 weighs more than 44lbs. is is possible to build a medium with equivalent parts like yours, to weigh 44lbs or less? Thanks in advance Neeko👍🏻

@neekodevinchi 5 месяцев назад

Hi there, Sincere apologies for the delay. In answer to your above questions:- 1. Using one of the 48v batteries will add weight. Depending on the capacity, the increased weight will vary. However, only the proprietary Bafang batteries have the built in BMS which will allow you to monitor the health of the battery via the display, app or BESST Tool. 2. I have seen others use Mobilith SHC grease for gears and have claimed to have got the motor more quiet. However, Bafang have recently announced a new grease which is universal for all motors which I'll be testing in due course. If this new grease makes the motor's quieter, I'll gladly spread the word. So keep a watchful eye. 3. Truth be told, I've not had any reason to crack open my M820 at this point. After 600miles, the motor still feels the same as the day I installed it. The same thing for the 410wh battery and the other components for the system. 4. I'm aware of other frames which use the M820 system. Some of these frames are a bit small for me. However, the frames which come in XL size will be featured on my channel. Again, keep a watchful eye. 5. It is possible to get the bike lighter (sub 20kg/44lbs). However, I suspect that most builders 'may' have to be selective in terms of components used. For me, I wanted a versatile trail/Allmountain emtb. Thus, the components used reflects the build. But my Fox36 emtb rhythm fork is slightly heavier than a regular Fox36/Rockshox Lyrik Ultimate. So you could make the bike lighter by carefully choosing components (in accordance with the build and application you want the CEF50 to fulfil). Once again, apologies for the delay but let me know if you have any further questions👍🏿

@AkizaIzinski-ch7mp 5 месяцев назад

@@neekodevinchi you're a legend. Thanks for replying👍🏻

@JoLe1991 5 месяцев назад

my 160Nm Toseven DM01 hasn't ever snapped a chain, because it has a properly tuned shift sensor. my most recent build with the bafang M435 also has a shift sensor mounted onto the brake switch port. without it, every shift would be crunchy, because of the slight overrun. any mid drive ebike SHOULD have a shift sensor, ideally a tunable one

@filthyMTB 7 месяцев назад

Is it very noisy?

@neekodevinchi 7 месяцев назад

The motor isn't as loud being heard by human ears (imo). Definitely, I've come across louder motors. But I'll soon release a further video comparing the sound of the CEF50/M820 and other emtbs👍🏿

@ElevatedVehicles 6 месяцев назад

As loud as it is, no thanks

@neekodevinchi 6 месяцев назад

I must admit, the motor isn't whisper quiet. I suspect the motor can be quietened by using different grease. So I'll look into that if/when the M820 motor needs a service👍🏿

@ElevatedVehicles 6 месяцев назад

@@neekodevinchi that would be a great video to see you open it up & see how much grease it came with from the factory 🏭

@8383happi 7 месяцев назад

Hi. Any chance this CEF50 can fit a coil?

@MackHartford 10 месяцев назад

Are you serious!!! Can this ebike keep up with a Specialized Levo?😯

@neekodevinchi 10 месяцев назад

Myself and 3 of my friends took my Levo, Whyte E150 and Dengfu E08 (with Shimano EP801) out, so we could guage the performance of the Bafang M820. Whilst the Whyte with the Bosch Gen4 had the edge, the M820 could hold its own against the Brose motor. Granted a sustained climb, the Levo would have the edge, due to having a bigger battery. But short punchy climbs, they were comparable. The E08 seemed to lose out unfortunately. But rumour has it that Shimano will be releasing a new firmware update in January/February 2024, which will raise the maximum current (increase motor power). So I'm more than happy to revisit the performance aspect of the CEF50 with M820 next year👍🏿

@prophetzarquon1922 10 месяцев назад

@@neekodevinchi So glad you mention the battery as a big factor in climbing power! My experience has been that lower Wh batteries don't climb well for very long at all, due to the far-lower total Wh delivered at high discharge rates.