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

[jahknob]

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]

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]

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

 

[vfr400]

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]

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

The G310? Rare as hens teeth.

Edit found the beast: https://www.ebikes.ca/shop/electric-bicycle-parts/motors/mg311-very-fast-wind-16.html

$387 shipped to UK...

 

[jahknob]

Isn't that G310 a front motor? I need a rear...

 

[jahknob]

Wait, think I found the rear version here:

Hub Motors - Ebike Parts - Shop

We carry a very wide assortment of front and rear hub motors for just about every need. From the tiny G311's to the mighty RH212. All our motors are unlaced and can be hand-built into a rim of your choosing. Most motors are available in at least two different winding speeds as well.

www.ebikes.ca

Is this a good bet for what I want to do?

 

[jahknob]

Sorry - this might be correct link:

MG310_Fst - Motors - Ebike Parts - Shop

<p>The Bafang G310 motor is a compact disk compatible 2.5kg rear hub with a nominal 250-350 watt power rating that works great for stealthy systems that do not require significant assist for steep hills or cargo. This motor includes an internal 6-pole spe

www.ebikes.ca

 

[Nealh]

Bafang RM G310.250.DC rear drive motor 250 W 10T 280RPM

This Bafang new design of rm G310.250.DC rear-drive motor, which is compatible with the disc brake with cossette body, has a rated power of 250 W, a reduction ratio of 1: 11 and a maximum torque of 42 N.m very light weight 2.5 kg, providing smooth power for vehicles. This motor has two-steps...

motowoks.com

 

[wheeliepete]

Bafang RM G310.250.DC rear drive motor 250 W 10T 280RPM

This Bafang new design of rm G310.250.DC rear-drive motor, which is compatible with the disc brake with cossette body, has a rated power of 250 W, a reduction ratio of 1: 11 and a maximum torque of 42 N.m very light weight 2.5 kg, providing smooth power for vehicles. This motor has two-steps...

motowoks.com

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

 

[Nealh]

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.

 

[Nealh]

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.

 

[vfr400]

The G310? Rare as hens teeth.

Edit found the beast: https://www.ebikes.ca/shop/electric-bicycle-parts/motors/mg311-very-fast-wind-16.html

$387 shipped to UK...

That's not it. The tiny one is about 1/4 the size of that one. It's designation is H600, and it's about the same size as the Xiongda YT-06, which is shown in this photo (front).

 

[Nealh]

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.

 

[vfr400]

That might be the same one. Bafang have changed all their designations recently.

 

[Nealh]

It's 145mm D/O , H600/G370,250DC.

零部件

Bafang description

www.bafang-e.com

Also reading it might be as low as 1.4 kg in weight.

 

[wheeliepete]

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".

 

[anotherkiwi]

Launched in 2017 https://www.bike-eu.com/sales-trends/nieuws/2017/05/bafang-launches-e-shaft-and-mini-hub-motor-at-china-cycle-10129872

And too slow and too wide...

 

[anotherkiwi]

Bafang RM G310.250.DC rear drive motor 250 W 10T 280RPM

This Bafang new design of rm G310.250.DC rear-drive motor, which is compatible with the disc brake with cossette body, has a rated power of 250 W, a reduction ratio of 1: 11 and a maximum torque of 42 N.m very light weight 2.5 kg, providing smooth power for vehicles. This motor has two-steps...

motowoks.com

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?

 

[wheeliepete]

The only problem to solve now is magnets flying off at over 400 rpm

If their imformation is correct, then the motor from Motowoks is much slower, so will not reach 400 rpm @ 48v. This matches the spec. from Bafang.

零部件

Bafang description

www.bafang-e.com