Can anyone recommend - 36v/350w/135mm/Juliet/36h compact rear hub motor for 16" wheel?

jahknob

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As per the title, I have some experience with electric conversion kits for my Brompton, but not much else.

I'm trying to convert another 16" wheel folder (Mezzo), but this needs a rear wheel motor. Specs ideally would be 36v/350w/135mm/Juliet/36h compact (i.e. small hub diameter) rear hub motor for 16" wheel. Just need the motor. Presume I need a high RPM gearing for a small wheel?

I don't have the experience to know which brand/model would be a good bet for this application.

Any thoughts/help/recommendations appreciated..

j.
 

vfr400

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Q100H for free-wheel gears, Q100C for free-hub gears. You can get them from BMSbattery.com ir equivalent AKM motors from Topbikekit.com. I think Greenbikekit.com have them as well.

16" wheels come in two sizes: Chinese 305mm and Brompton 349mm. Check you bikes, wheel size if you're thinking of buying a ready-built Chinese one.
 

Nealh

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GBK do the small gbk100 series of silver hubs, look identical to Q100/AKM.
Also available is Bafang SWXH.
 

vfr400

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There's a new tiny Bafang cassette motor that I'd love to try, but I've not seen any resellers stocking it yet. It's on the new Ebco bikes
 

anotherkiwi

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jahknob

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Sorry - this might be correct link:

 

Nealh

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wheeliepete

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Nice find there Nealh, good price if free postage is correct.
 

Nealh

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I just went to the payment and it came up Free shipping so not bad £147, buyers might need to budget another 25 - 30 for duty as it is couriered by DHL/FedE/UPS.
D2D is 6/7days.

42nm max is quoted but see they also mention it can give 50nm isn't too shabby for a hub and 11.1 gear ratio, 25a is the max current rating and only 2.5kg.

I'm also reading else where the freehub body can take up to a Shimano 10 spd cassette.
The planetary gears are like the Q128C and are a two stage nylon reduction gear and not a single stage gear like on the 5:1 hubs. 137 hub parts.

33171
 
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Nealh

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The other thing is motor RPM you would have to inquire and ask for the RPM to suit your needs, for most 230- 250rpm in 26/28" wheel would be good.
Disk holes are blind so no water ingress here.
 
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Nealh

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I think this is still not the tiny cassette hub motor that VFR mentioned, as Bafang do a smaller lighter 1.7kg G370.250DC hub.

https://flic.kr/p/WUiv2H
And my post crosses with VFR's reply.
 
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Nealh

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It's 145mm D/O , H600/G370,250DC.
Also reading it might be as low as 1.4 kg in weight.
 

wheeliepete

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The other thing is motor RPM you would have to inquire and ask for the RPM
I asked about diff. speed motors and they only do one, not clear on RPM, just said 25 kph, which isn't that helpful.
Edit;
Just came back with 12 or 13T winding, so 230/250 RPM, suitable for 26,700c and 28".
 
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anotherkiwi

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anotherkiwi

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You are my savior! I have been looking everywhere other than ebike.ca where the same motor costs over $300 shipped. The only problem to solve now is magnets flying off at over 400 rpm (48v x 8.5 rpm/v = 408 rpm) - ebike.ca have a rotor with magnets re-glued with high temp epoxy. I wonder how hard that can be?