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

[thaeber]

The density of the cfk tube is appr, 1.5 g/cm3, aluminum is 2.7 g/cm3. So You can save roughly 400g if You use same wall thickness..

 

[savas]

Battery case should be around 400gr.

 

[pjpavlas]

Battery case should be around 400gr.

@LAnton already measured the battery case weight on the scale and has almost 1kg.

 

[thaeber]

measured the battery case weight on the scale and has almost 1kg.

This is what I took as reference - Your picture on the scale, 966 g for the aluminum housing without end caps

 

[stuff]

What to connect to the yellow green wire?

View attachment 120405

Looks like canbus? But I may be mistaken

 

[savas]

@LAnton already measured the battery case weight on the scale and has almost 1kg.

I mean the carbon or Abs one Diy.
The original one is too heavy

 

[mike_kelly]

Looks like canbus? But I may be mistaken

Canbus is four wire. Looks like an older serial connection probably not used in this instance.

 

[mike_kelly]

Got my external battery connected and working.

CEF50 External battery build

I took a chance on the CEF50 because I wanted a very light eMTB. Because of that I chose a light battery and planned to get an external battery to supplement the internal on long rides. Two things got in the way, Bafang is way behind on delivering internal batteries let alone their promised...

www.emtbforums.com

 

[spokémon]

What to connect to the yellow green wire?

Linda said to me "It is signal cable, do not connect anything."

 

[spokémon]

Looks like canbus? But I may be mistaken

i agree it's probably canbus for Bafang OEM battery

 

[spokémon]

i agree it's probably canbus for Bafang OEM battery

Canbus is four wire. Looks like an older serial connection probably not used in this instance.

Thanks Mike

 

[spokémon]

Give a link to the store

most aliexpress tubes are too small in diameter. this is the only store I found with good size diameters. actually looks almost perfect in size.

carbon tube

 

[thaeber]

most aliexpress tubes are too small in diameter. this is the only store I found with good size diameters. actually looks almost perfect in size.

carbon tube

This link does not work in Germany. What is the correct diameter for the tube?

 

[LAnton]

The battery without the case is very well made.

 

[thaeber]

The battery without the case is very well made.

View attachment 120478 View attachment 120479 View attachment 120480 View attachment 120481

Could You please measure the outer / inner diameter of the housing?

 

[LAnton]

Could You please measure the outer / inner diameter of the housing?

Internal 72mm, Externat 77mm

 

[thaeber]

Internal 72mm, Externat 77mm

Great! Thanks!

 

[thaeber]

I found 77x73x1000 mm on Amazon Germany. Price is 320€, quite expensive. Would 1000mm be enough to build 2 cases?

 

[LAnton]

I found 77x73x1000 mm on Amazon Germany. Price is 320€, quite expensive. Would 1000mm be enough to build 2 cases?

Yes. I don't see the point of making a case. The battery is quite firmly assembled. I think an aluminum rod and a good adhesive tape are enough. It is also possible to fix the battery in the frame with mounting foam. I'll try to do it.

 

[Freda]

The 930 geo states BB height is at 335 only. This means at 160/150 mm travel, the BB height fully compressed is at appr. 180mm only, so ground clearance with 165 mm crank is 15mm only. The CEF50 BB height is 360.
By checking the geo of the 930 again, I found a mistake in the geo logic: BB drop is given at 30mm, the BB hight at 335mm. The diameter of a 29 x 2.6 wheel is appr. 760mm. This means, the radius is 380mm. BB drop of 30mm would result in a BB hight of 380-30= 350mm, not 335mm. Either they assumed a very small tire, or they just didn’t do the math correctly.

That is strange, this is why comparing the drop is always better, it is also easy to check from drawing. According to the drawing 30mm drop seems accurate. A cef50 with mullet setup has lower bb then lce930.

 

[thaeber]

That is strange, this is why comparing the drop is always better, it is also easy to check from drawing. According to the drawing 30mm drop seems accurate. A cef50 with mullet setup has lower bb then lce930.

Therefore I would go with a 216 mm damper with mullet wheels and finetune with 2mm offset bushings..

 

[LAnton]

A very good 720W battery. I don't understand how you can drive 360W. An electric bike with a 360W battery is not a very good solution for good rides.

 

[spokémon]

A very good 720W battery. I don't understand how you can drive 360W.

View attachment 120622 View attachment 120623

Because I don't think I can last riding for 6hrs even with a motor!

 

[Myalteregohamish]

Ladies and gentlemen,

I am proud to announce my V1.0 pre-shakedown build of the long awaited CEF50 in XL. Please find for your viewing pleasure the raw shots of what is now my indoor bike build center. A little about the build and the intention. The proposed challenge; is it possible to build quality, agro trail/enduro 50+nm eMTB carbon build for ~3K USD. To answer, yes I think it is. The bike you see below is 47.5LBS for wet weight assegai's front and rear, with kush core, Deore drive train and brakes including ICE tech rotors. The HA is 63.5 with 29er, and mullet is 63.0.

Additionally I am experimenting with how the 180 rotors perform with decent TRP pads, up against my thicker and larger 200+ rotors over time on typical trails I ride. My theory is that in 95% of the cases the heat issues from smaller rotors won't be as noticeable if paired with a good bedding in the beginning.

I do still have questions about how to modify the profiles on the Befang 820 so any guidance there is more than welcomed. Otherwise I am very happy with this build so far. To be added, frame protection, grease all picot touch points and loctite. I want to get through an initial shack down first.

 

[Herculesridesebikes]

Has anyone experimented with 52.5 rear shock 29er yet? I'd like to know how much clearance there is before I trigger on a shock.

 

[Kekkula]

29” with 52,5mm stroke.

 

[clix]

anyone experimented with 52.5 rear shock 29er yet? I'd like to know how much clearance there is before I trigger on a shock.

29” with 52,5mm stroke. View attachment 120814

Is that real full compression? Usually because of the rubber bottom out bumpery that is the socks, it is quite hard to compress the shock by hand fully.

 

[Kekkula]

Is that real full compression? Usually because of the rubber bottom out bumpery that is the socks, it is quite hard to compress the shock by hand fully.

There might be something like 0,2mm more when I put my 85kg body weight on it, but it not make noticeable difference.
Frame size is M btw.

 

[Herculesridesebikes]

Has anyone experimented with a 29er as well as a mullet set up with this frame? Im not sure what way to go. I'm going to be running 170mm fork, Im coming from a 27.5 bike so I'm leaning towards mullet but dont want to change the Geo that much.

 

[Myalteregohamish]

Has anyone experimented with a 29er as well as a mullet set up with this frame? Im not sure what way to go. I'm going to be running 170mm fork, Im coming from a 27.5 bike so I'm leaning towards mullet but dont want to change the Geo that much.

HA in 29 is 63.5, mullet is 63.0. Bike in 29 is already super nimble.