Help me build e-bike (mtb)

Smurf2

100 W
Joined
Jun 25, 2022
Messages
158
Hi.
I want build e-bike. I am around 60kg. My past bulild was e-skate and drone.

Plan is bought E-bike KIT from Aliexpress, or Ebay,
at first for using go to Job (44km), and others..

Plan:
Type: Mtb
Power: 350W-500W?
Voltage: 36V
Distance: around 40-44 km
Speed: 30+ km/h
Motor: Rear Hub
Wheel: 26inch
Throttle: half or full
PAS and e-brake: ?

I will need your opinions and some explanations about parts which not understand good.

1) I saw videos where is speed of 350W and 500W same like 20mph(32km/h) Which power you reccomend me for speed 30 km/h or little higher?

2) First what I don't understand good is PAS. On some video throttle not start before pedal not mowing. I am comfused,
because on other videos throttle start immediately on hand turn (without move pedal), what is true? Talking about HUB motor.

Thanks.

EDIT: I want drive without pedals, just throttle, on flat..
 
Where meant to go, it is flat. But some extra power is not bad to have.

I looked more videos, I see that I am not got too much speed with increase wats motor..🙄
Also 500w motor gives only 30km distance?

But, distance will be important then speed to me.

Thinking now about 48v battery... it is not too much expensive then 36v battery...🤔
 
Smurf2 said:
Where meant to go, it is flat. But some extra power is not bad to have.

I looked more videos, I see that I am not got too much speed with increase wats motor..🙄
Also 500w motor gives only 30km distance?

But, distance will be important then speed to me.

Thinking now about 48v battery... it is not too much expensive then 36v battery...🤔

You should be fine with a 36V 20A or so controller. For PAS, the KT controllers are popular. If you get a PAS sensor with more magnets (e.g. 12 vs. 5), the response will be a little faster, and take a 1/2 turn or so of the crank to engage. A torque sensing PAS will react immediately, but you'll need to invest more in a controller that supports torque sensing PAS, which most do not. Using a little throttle from a stop is an easy option.
https://ebikes.ca/tools/simulator.html?motor=MG60_500&batt=B3617_35E&cont=C20&hp=0&axis=kph&frame=mountain&autothrot=false&throt=100&grade=0&wheel=26i&mass=110&cont_b=cust_70_200_0.03_V&motor_b=MGRIN_FST_SA&batt_b=cust_72_0.05_16&wheel_b=20i&mass_b=136&hp_b=0
 
I would go for a 1200w battery for 36v to net 33a, but buy a 750w sensorless controller (36v x 21a = 750w) matched to whatever sensored/unsensored brushless motor you got or can find. If you like the motors speed for the voltage, or if you want a touch faster go 48v battery. The battery is the heart and soul, do not skimp, that 12a difference could mean a lot of money. I tell you this much, my controller is 36v 35a, and its plenty of power. I weighed 265lbs this morning, do short steep hills no problem. Do long hills, easy.

Battery $1000
Controller $30

Your choice, 36v is plenty I doubt you'd need 48v. But you'd need total power for hills, thats where "power" shines. 36v is plenty of speed, another reason to bump up voltage is to get more total power, 52x x 30a is 1500w, doesnt take much to swing watts upward :thumb:

When I was playing around with low power, wimpy setups. There was a fine line between enjoyment and a physical workout, even on the slightest of hills. For me that range was around 700-1200w that should be avoided, for my heavier weight at that time, and the terrain I ride daily. Right now on my 36v it does 35a so 1260w which for me is good until the 2 yr old battery gets near the end of the battery where its weaker and you got to baby it more (pedal a lot more), nurse it back to health, one watt-hour at a time charging. But if I saw Everest ahead, plug in my 52v 40a battery into the 36v 35a controller and 52v 35a = 1820w. I figure for the hills I avoid, I require a minimum of 2500 if not 3000w. The Leaf 1500w could take that, perhaps with a bit of FerroFluid for short durations of time, like up a hill. I have no real life experience at those power levels, but if I were to play that game, I'd aim for a 72v 50a 3600w battery, and a controller rated for 72v 40a 2880w. Do immediate test runs to see if its suited for your terrain and speed tolerances. Do your hardest hills first. I avoid a handful of hills near me. Others I need to huff and puff with some old school pedalling, which doesn't hurt the waist line one bit. Some corkers out there breaking a bead of sweat on their bso's, I love it. Not sure what the strangest thing you ever saw while out riding but for me its been the birds flying along side me while ebiking. Its something else man.
 
Thanks guys.
But read please my edited Post#1.

I will drive just with throttle, not pedaling, on flat. For pedaling I always can use a normal bike :)

And 750w+ motor, or battery $1000, to much for me.

At first need range 40-44 kilimeters with one charge, if possible.
 
Is bike Stevens SMC 1 Team have enough space for battery 36/48v + controller?
I mean buy it now.
https://www.bike-magazin.de/__image/a/3981096/alias/xl/a/b/c/1/ar/4-3/stevens-smc-1-team.jpg
 

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Smurf2 said:
Is bike Stevens SMC 1 Team have enough space for battery 36/48v + controller?
I mean buy it now.
https://www.bike-magazin.de/__image/a/3981096/alias/xl/a/b/c/1/ar/4-3/stevens-smc-1-team.jpg

You may want to read a few threads on carbon frame conversions.
 
E-HP said:
You may want to read a few threads on carbon frame conversions.

Searching, but don't know what we looking for.
This is one of cheap frame (48 cm) I found, light and nice.
 
Smurf2 said:
Thanks guys.
But read please my edited Post#1.

I will drive just with throttle, not pedaling, on flat. For pedaling I always can use a normal bike :)

And 750w+ motor, or battery $1000, to much for me.

At first need range 40-44 kilimeters with one charge, if possible.

Either spend the money on an adequate battery and motor or pedal. You can't really have it both ways.
 
Looks like this kit would meet your requirements, but at 48V. If you select the 26" with 48V 17.5Ah battery, it looks like they use Samsung 35E cells, so a decent pack:
https://www.amazon.com/BAFANG-Electric-Bicycle-Conversion-Display/dp/B07R46YVPB/ref=asc_df_B07RBKJ11D/?tag=hyprod-20&linkCode=df0&hvadid=475718381184&hvpos=&hvnetw=g&hvrand=663096343758536716&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032001&hvtargid=pla-789405302760&th=1&psc=1
https://ebikes.ca/tools/simulator.html?motor=MG60_500&batt=cust_48_0.2_17.5&cont=C20&hp=0&axis=kph&frame=mountain&autothrot=false&throt=100&grade=0&wheel=26i&mass=110&cont_b=cust_70_200_0.03_V&motor_b=MGRIN_FST_SA&batt_b=cust_72_0.05_16&wheel_b=20i&mass_b=136&hp_b=0
Look for something similar on ebay or AliExpress if that's what your preference is.
 
Yes, not have Amazon near me, so the shipping is rediculles there for my country.
Sometimes buy on ebay, when no other opions, but all items buy from Aliexpress.

Found only 2 items where can change thumb for full throttle. But I will buy aditional Half throtyle too.

https://a.aliexpress.com/_msMjAt8
48v, lcd3set, 500w,
https://a.aliexpress.com/_mLvg5Bc

This items are without battery. So need it buy separatelly.

Btw, you set 110kg, but guys, don't forget, I am 60 (for now). :)
 
Smurf2 said:
Yes, not have Amazon near me, so the shipping is rediculles there for my country.
Sometimes buy on ebay, when no other opions, but all items buy from Aliexpress.

Found only 2 items where can change thumb for full throttle. But I will buy aditional Half throtyle too.

https://a.aliexpress.com/_msMjAt8
48v, lcd3set, 500w,
https://a.aliexpress.com/_mLvg5Bc

This items are without battery. So need it buy separatelly.

Btw, you set 110kg, but guys, don't forget, I am 60 (for now). :)

Hard to tell what you get with those kits. They don't really say if they are geared or direct drive motors, and they show pics of both. Price looks good.
 
I think all of them on Ali (almlost all) are the same, and I found this photo, where name iz Gearless motor, but you can find more others.

The best thing on this site is that you see what other boughts, in picture and comments, and that other pages not have. Some of buyers opened motor and show to others, but I can't find now that pic.

EDIT: also, not see any clear details in my links abowe, is that casette or freewheel.. must contact seller or change. And don't know for my bike what will have. (Bellow picture not from my links abowe).

EDIT: Found this. You got 2xPASS.
https://a.aliexpress.com/_mP0u8ua
Do you know is my bike have cassette or freewheel??
 

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Found table where Speed is show for all this motors.
I see that only 750w can go 40/kmh.
But all 26" 750w are Sold Out :)

Do you maybe know from picture is my bike have Casette or Freewheel?
(This bike is from net..not mine yet).
 

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E-HP said:
Smurf2 said:
Do you maybe know from picture is my bike have Casette or Freewheel?

10 speed cassette

I count 9, but definitely a cassette. 8, 9, and 10 speed all fit on the same size freehub body, which is the only size I've ever seen on a hub motor.
 
Thanks guys. I will buy bike for weekend.

Found this battery 48v 20Ah.
It is the only one I found with 103 possitive and 3 negative feedbacks.
I think will try with that.
https://a.aliexpress.com/_mNq1yvc
(212$+53$ shipping)
 
Smurf2 said:
Thanks guys. I will buy bike for weekend.

Found this battery 48v 20Ah.
It is the only one I found with 103 possitive and 3 negative feedbacks.
I think will try with that.
https://a.aliexpress.com/_mNq1yvc
(212$+53$ shipping)
Skeptical.
 
This, 48v 17.5Ah ?
They said it's Samsung 35ET 3500mAh 65pcs.
Price 342.53$
https://a.aliexpress.com/_mN1NnaE
 
Smurf2 said:
This, 48v 17.5Ah ?
They said it's Samsung 35ET 3500mAh 65pcs.
Price 342.53$
https://a.aliexpress.com/_mN1NnaE

That one is more believable, since the numbers add up. There are a couple versions of Hailong battery cases; a 65 cell max and an 80 cell max. Neither would get you to 20Ah on generic Chinese cells, which the pricing indicates. The numbers add up on the one you just linked though, so you'd just need to make sure they contain the actual 35E cells as advertised.

65 pieces would be 13S5P so 5x3.5 = 17.5, so that checks out. :thumb: Price on 35E cells is around $5, so $325 in cells, which is the only questionable part, since there's also the cost of the case and BMS. Still much more in the ballpark than the other pack you originally linked. I don't know if there's a difference in performance or pricing for the 35ET cells, but maybe they are cheaper than the 35E.
 
Guys, forgot please my Stevens SMC1, because seller sold it :cry: We had deal to buy it for weekend, but he cheated me and sold it before weekend start. I want to cry. :cry: :cry: You see how peoples are Evil :evil: :roll:
Now searching other bike.

Also, I ordered battery.
 
And finally, I bought bike FUJI ODESSA. I think overpaid it, for this condition, but I like it!

It has 8x3 gears. Do you recognize from pictures is that cassette?
I can disassemble it but will be hard return it back in center.

If you sure that is cassette, then I will finally order Cassette Motor Hub Wheel Kit (and with sale -30% now) :)

EDIT: I see and read top ring, where is labeled " sunrace 400kgfcm u.s. pat. 5409422".
Steel can't find what is it.. :?:
 

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8 speed wheels are overwhelmingly likely to have cassettes rather than freewheels, but there are a few 8 speed freewheels out there. From what little I can see in your photos, that may be what you have.

Remove the wheel from the bike to be sure. Here's a guide on how to tell them apart.

If you get a freewheel hub motor, you'll have to add some right side axle spacing to make room for the wide 8 speed freewheel (because the hub will be spaced for 7 speeds). Also, you'll need to dish the wheel to compensate for the offset you add at the axle

If you get a cassette version, it might have a weaker axle and it may cost more than a freewheel hub motor. But it won't require any modifications. You won't be able to reuse your freewheel (if that's what you have) so you'll need to buy a new cassette.
 
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