M820 + CEF50 Dream Bike Build

georg3__

New Member
Oct 8, 2023
11
3
Canada
Howdy from Canada.
I've been on the fence about e-bikes but finally decided over the winter I would build a bike I've always wanted. I'm very new to this hobby and excited for what 2024 holds...

Bikes I considered: Trek Fuel EXe 5 and Giant Trance X
Purpose of the bike: Jack of all trades commuter bicycle that is durable, light and legal.

Bill of Materials (thus far)....

BatteryCame with Frame Samsung 2100 Cell (48v/700wh) with carbon material case
Brake PadsSwiss Stop Disc 27 RS (each set - 0.04 kilograms)
BrakesShimano Deore M6120 Brake 4 Piston
CableShimano XTR M9000 MTB Shift Cable Set
CassetteSHIMANO DEORE XT 12-Speed MTB Cassette Sprocket (MICRO SPLINE freehub body)
ChainKMC 12 Speed
Chain GuardCame with frame
Chain RingCame with frame
CranksetCarbon crankset (came with frame)
DisplayBafang DP C245.CAN V3.0
DrivetrainBafang M820 48V
Dropper LeverT.B.D
Dropper SeatpostKS Exaform 900i 31.6x498
FrameLarge CEF50 Frame
Front RotorShimano Deore XT RT-M800, 203 mm, center lock
Front Shock2023 Fox Factory 36 29" 15QR Grip2 44mm offset / 160mm
Front TireT.B.D
Front WheelAliExpress 29" Tubeless 148x12 mm
GripsODI Pro Mountain Bike Grips
HandlebarCarbon Fiber 740mm width handle bar
HeadsetNukeproof Neutron ZS56 Headset Int Cable Routed Black Option
Mirror
Pedals
Rear DerailleurShimano XT RD-M8100-SGS
Rear RotorShimano Deore XT BR-MT800, 180mm, center lock
Rear Shock2023 Fox FLOAT X2 Factory Rear Shock (210 x 52.5 mm)
Rear Tire
Rear WheelAliExpress 27.5" 148x12 mm
Seat (Saddle)
Seat Post ClampRide Alpha Race Seat Clamp TI Bolt
Shift LeverShimano Deore SL-M8100-R
Speed Sensor Magnet
Stem
Tubeless valve stem kit

Range calculation ...
Battery: 48V / 700wh
Ah = 700 wh / 48 V = 14.58 Ah
Then using this tool I should get around 42 km (super hilly) - 70 km (flat) for a average of 56 km.


Thanks for reading
 
Last edited:

mike_kelly

Well-known member
Subscriber
Aug 11, 2022
942
774
US
Howdy from Canada.
I've been on the fence about e-bikes but finally decided over the winter I would build a bike I've always wanted. I'm very new to this hobby and excited for what 2024 holds...

Bikes I considered: Trek Fuel EXe 5 and Giant Trance X
Purpose of the bike: Jack of all trades commuter bicycle that is durable, light and legal.

Bill of Materials (thus far)....

BatteryCame with Frame Samsung 2100 Cell (48v/700wh) with carbon material case
Brake PadsSwiss Stop Disc 27 RS (each set - 0.04 kilograms)
BrakesShimano Deore M6120 Brake 4 Piston
CableShimano XTR M9000 MTB Shift Cable Set
CassetteSHIMANO DEORE XT 12-Speed MTB Cassette Sprocket (MICRO SPLINE freehub body)
ChainKMC 12 Speed
Chain GuardCame with frame
Chain RingCame with frame
CranksetCarbon crankset (came with frame)
DisplayBafang DP C245.CAN V3.0
DrivetrainBafang M820 48V
Dropper LeverT.B.D
Dropper SeatpostKS Exaform 900i 31.6x498
FrameLarge CEF50 Frame
Front RotorShimano Deore XT RT-M800, 203 mm, center lock
Front Shock2023 Fox Factory 36 29" 15QR Grip2 44mm offset / 160mm
Front TireT.B.D
Front WheelAliExpress 29" Tubeless 148x12 mm
GripsODI Pro Mountain Bike Grips
HandlebarCarbon Fiber 740mm width handle bar
HeadsetNukeproof Neutron ZS56 Headset Int Cable Routed Black Option
Mirror
Pedals
Rear DerailleurShimano XT RD-M8100-SGS
Rear RotorShimano Deore XT BR-MT800, 180mm, center lock
Rear Shock2023 Fox FLOAT X2 Factory Rear Shock (210 x 52.5 mm)
Rear Tire
Rear WheelAliExpress 27.5" 148x12 mm
Seat (Saddle)
Seat Post ClampRide Alpha Race Seat Clamp TI Bolt
Shift LeverShimano Deore SL-M8100-R
Speed Sensor Magnet
Stem
Tubeless valve stem kit

Range calculation ...
Battery: 48V / 700wh
Ah = 700 wh / 48 V = 14.58 Ah
Then using this tool I should get around 42 km (super hilly) - 70 km (flat) for a average of 56 km.


Thanks for reading
Your stated goal "Jack of all trades commuter bicycle" does not match your parts list which is a for a hard core mullet enduro bike. A mullet enduro is designed to go downhill not be a good commuter.
 

georg3__

New Member
Oct 8, 2023
11
3
Canada
Your stated goal "Jack of all trades commuter bicycle" does not match your parts list which is a for a hard core mullet enduro bike. A mullet enduro is designed to go downhill not be a good commuter.

Thanks for the feedback :D.

I researched for months on this and decided to just over build it and offset the weight penalty with carbon bits...
 

mike_kelly

Well-known member
Subscriber
Aug 11, 2022
942
774
US
The problem is that the geometry is very different for the different use case. A Enduro rider is going downhill most of the time. So the geometry is "tilted" back so you aren't hanging over the handlebars as you go down. The smaller rear wheel adds to this effect. Great if you are an enduro rider. But if you are a commuter or trail rider this geometry does not make sense. So if you go this route you need to be an Enduro rider most of the time.
 

georg3__

New Member
Oct 8, 2023
11
3
Canada
You write „came with frame, carbon battery, carbon cranks…

Did You get this parts allready? Misunderstood from my side?
Alibaba seller told me the carbon battery case is coming at the end of the month and carbon cranks should be available this week. This should be a > 100g weight savings :]
1697062416300.png

1697062244683.png

1697062282231.png

1697062257265.png

^^ The default crank
1697062318420.png
 


georg3__

New Member
Oct 8, 2023
11
3
Canada

Did more and more research ebikes, the weight of all the components I was going to put on the frame, my ideal use cases and I decided that I want more torque.

I think the M820 with some 27.5" rims, lightweight suspension and a cargo box would be perfect for the gig economy and puttering about the city...

I'm trying to chase the thrill of my motorcycle but e-bike and bicycles are insane >.>

Fortnine video about this
 
Last edited:

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