Biggest hub motor with 135mm dropout and fits 5+ gears?

[diwhyguy]

Hello! I'm trying to find a big hub motor to put on my mountain bike. It's hard to find anything that fits normal dropouts, has room for gearing, and supports at least 2kw.

I'm also looking for something wound low so it only hits ~50kmh. I want torque.

The only motor I can find is Crystalyte H4065 and its extremely expensive (cheapest configured $750) https://electric-bikes.com/betterbikes/hseries.html

Is there anything else? Somehow, despite hundreds of millions of these hub motors being made, the DIY aftermarket is a wasteland. It's so frustrating! 99% of the Chinese stuff is for 155mm dropouts, its extremely hard to find big motors that fit regular bike frames. I could bent my dropouts to fit, but I still wouldn't have any room for gearing. I still want my bike to be a bike

 

[ZeroEm]

The most popular one that fits 135mm rear fork with a 7 speed is the leafbike Black Lighting 1500w rear hub motor we call leafmotor. It's not the leafmotor site.
I put a link to the thread if you want to do some reading and another link to the motor it self on the leafbike site.

They sell the motor as 1500w but it will run at 2000w with out getting hot. Most run it 3000w with cooling mods and upgrade the wiring for up to 7000w for short periods Make sure to monitor your temp.

Leaf Motor Thread
leafbike Black Lighting Motor

by diwhyguy » Aug 30 2021 11:04pm

Hello! I'm trying to find a big hub motor to put on my mountain bike. It's hard to find anything that fits normal dropouts, has room for gearing, and supports at least 2kw.

I'm also looking for something wound low so it only hits ~50kmh. I want torque.

The only motor I can find is Crystalyte H4065 and its extremely expensive (cheapest configured $750) https://electric-bikes.com/betterbikes/hseries.html

Is there anything else? Somehow, despite hundreds of millions of these hub motors being made, the DIY aftermarket is a wasteland. It's so frustrating! 99% of the Chinese stuff is for 155mm dropouts, its extremely hard to find big motors that fit regular bike frames. I could bent my dropouts to fit, but I still wouldn't have any room for gearing. I still want my bike to be a bike

 

[E-HP]

Hello! I'm trying to find a big hub motor to put on my mountain bike. It's hard to find anything that fits normal dropouts, has room for gearing, and supports at least 2kw.

I'm also looking for something wound low so it only hits ~50kmh. I want torque.

The only motor I can find is Crystalyte H4065 and its extremely expensive (cheapest configured $750) https://electric-bikes.com/betterbikes/hseries.html

Is there anything else? Somehow, despite hundreds of millions of these hub motors being made, the DIY aftermarket is a wasteland. It's so frustrating! 99% of the Chinese stuff is for 155mm dropouts, its extremely hard to find big motors that fit regular bike frames. I could bent my dropouts to fit, but I still wouldn't have any room for gearing. I still want my bike to be a bike

MXUS V3 3K-Turbo:
http://myelectricbikemotor.com/mxus-v3-3k-turbo-3000w-high-speed-electric-e-bike-hub-motor-48v-60v-72v-84v-96v-4/

"Even though it’s so powerful and has wide and efficient magnets, this motor can be fitted into small 135mm rear dropouts with a 5 speeds / gears freewheel or less number of speeds."

 

[ZeroEm]

by E-HP » Aug 30 2021 11:58pm

diwhyguy wrote: ↑Aug 30 2021 11:04pm
Hello! I'm trying to find a big hub motor to put on my mountain bike. It's hard to find anything that fits normal dropouts, has room for gearing, and supports at least 2kw.

I'm also looking for something wound low so it only hits ~50kmh. I want torque.

The only motor I can find is Crystalyte H4065 and its extremely expensive (cheapest configured $750) https://electric-bikes.com/betterbikes/hseries.html

Is there anything else? Somehow, despite hundreds of millions of these hub motors being made, the DIY aftermarket is a wasteland. It's so frustrating! 99% of the Chinese stuff is for 155mm dropouts, its extremely hard to find big motors that fit regular bike frames. I could bent my dropouts to fit, but I still wouldn't have any room for gearing. I still want my bike to be a bike
MXUS V3 3K-Turbo:
http://myelectricbikemotor.com/mxus-v3- ... 84v-96v-4/

"Even though it’s so powerful and has wide and efficient magnets, this motor can be fitted into small 135mm rear dropouts with a 5 speeds / gears freewheel or less number of speeds."

Can I pick the winding, maybe I can live with a five speed.

 

[markz]

Might have to spread the dropout (a few mm) to fit the 45H mxus aka 3kw.
Also might have to throw in a washer to fit inside the 7 or 8 spd freewheel like what I had to do on a Townie Electra 7D and 21D and mxus 3kw 45H.

The 5kw mxus has a much much wider dropout width then 135mm, my guess is 155-165mm o.l.d. but maybe you can get away with a single rear gear and grind the axle down, which is going somewhere where you cant come back from.

 

[E-HP]

by E-HP » Aug 30 2021 11:58pm

diwhyguy wrote: ↑Aug 30 2021 11:04pm
Hello! I'm trying to find a big hub motor to put on my mountain bike. It's hard to find anything that fits normal dropouts, has room for gearing, and supports at least 2kw.

I'm also looking for something wound low so it only hits ~50kmh. I want torque.

The only motor I can find is Crystalyte H4065 and its extremely expensive (cheapest configured $750) https://electric-bikes.com/betterbikes/hseries.html

Is there anything else? Somehow, despite hundreds of millions of these hub motors being made, the DIY aftermarket is a wasteland. It's so frustrating! 99% of the Chinese stuff is for 155mm dropouts, its extremely hard to find big motors that fit regular bike frames. I could bent my dropouts to fit, but I still wouldn't have any room for gearing. I still want my bike to be a bike
MXUS V3 3K-Turbo:
http://myelectricbikemotor.com/mxus-v3- ... 84v-96v-4/

"Even though it’s so powerful and has wide and efficient magnets, this motor can be fitted into small 135mm rear dropouts with a 5 speeds / gears freewheel or less number of speeds."

Can I pick the winding, maybe I can live with a five speed.

3T, 4T, 5T I think.

 

[ZeroEm]

I think about going to the next level. heaver motor, wider drop outs, bigger controller and more battery.

 

[markz]

"Probably" pick any custom winding (ex: 3.5T) you want if order direct from mxus factory.
Might take longer to get made and shipped then a common winding (3/4/5/6/7T+)
Leaf 1500W probably choose common
MAC geared I dunno, same probably but maybe higher windings 12T? I dunno

 

[ZeroEm]

The wider the stator the slower the motor, right? I would need to do the math on the build before picking. Have been in the 6-8 Kv range.

 

[diwhyguy]

Thanks everyone! The Leaf motor looks perfect!!!!

I can get wound to 25mph at 52v which is torquey and quick ~32mph at 72v! Not to start a flame war, but anyone going faster on cheap 90's mountain bike like mine has a death wish.

It's hilly here, up to 10% grade, so low winding option is great. My main reason for electrifying bike is to deal with hills. And please no flaming about mid-drive, I decided not to get one for typical reasons and because I already have Sabvoton 72150 from another project.

It looks like I can order with temp sensor? Hopefully kty83-121 that my Sabvoton supports. With temp monitoring I won't need to worry about melting anything so I can run 3kw.

If anyone is curious about build, here is what I'm planning

have:
    Sabvoton 72150 controller http://www.cnqsmotor.com/en/article_read/Sabvoton%20SVMC/SSC%20Series%20Brushless%20Sinusoidal%20Programable%20Motor%20Controller/537.html
    90's Raleigh MT-40 mountain bike

buy:
    12 - Mini ANL fuse for battery connect 
       need 100+ amp
    20 - 8 gauge battery wires
    20 - twist throttle 
    20 - another twist throttle for regen
    10 - torque arm 
    15 - brake levers with motor cutoff
    10 - emergency shutoff switch 
    200 - lipo battery 72v https://hobbyking.com/en_us/zippy-compact-4500mah-10s-35c-lipo-pack-xt90.html
    20- things to mount battery and controller
        "frame bag" is what you want
        places also make controller box for ebike
        luna cycle makes battery bags
    130 - 4 port battery charger https://hobbyking.com/en_us/turnigy-reaktor-touch-300-ac-dc-20a-1-6s-300w-touch-screen-balance-charger-us-plug.html?queryID=9344dd8b6722eb3477ab30922150a426&objectID=80557&indexName=hbk_live_products_analytics
    50 - battery safe
    20 - e bike brake pads https://lunacycle.com/kool-stop-v-type-brake-pads-for-electric-bikes/
    25 - suspension seat post
    300 - leaf bike "leaf motor" 
            https://www.leafbike.com/products/e-bike-hub-motor/26-inch-48v-52v-1500w-rear-bike-motor-wheel-1204.html
        check bike to see if freewheel or cassette before ordering
        get 25mph@52v winding
        order with temp sensor
            needs to be kty83-121 for Sabvoton

TOTAL PRICE: ~850

 

[neptronix]

The wider the stator the slower the motor, right? I would need to do the math on the build before picking. Have been in the 6-8 Kv range.

No. Speed is determined by the winding. The more you approach a square aspect ratio in the stator, the higher the efficiency tends to be ( less end turn losses per square meter of copper ). That's a good thing.

Some of the bigger motors may have lower kv, but this is not a design limitation of a large motor, more of a choice that vendors have made.

 

[neptronix]

The leaf is still a good choice, 5 years after we discovered it. You can also make a shit ton of torque with the 4T wind which almost does 40mph on 48v. I made more torque with 80A/48v than physics would allow. A low speed winding isn't necessary

Make sure to not get the cassette version because one of the axle sides is weaker than the other in that version. If you want to make high power, you'll want the freewheel version.

 

[ZeroEm]

Good choice or lack of options. I read you whole thread 2.5 years ago. You convinced me they are one of the best that still fit in standard forks with out to much trouble. Bought a cassette 7T so I know what you are talking about the different axel sizes on each side. I have a 5T Edge freewheel, picked up used. Spinningmagnets vouched for BillVon who was selling it, so I jumped on it.

I have 72V batteries and 40amp controllers that I have been getting by with. I'm trying to stay around 28 mph legal speed limit, pedaling is required. 20 mph throttle only.

There are plenty of options: 20"-29" wheels, 4T-9T windings, 36V-96V batteries, upright eBike to Velomoible.
I want my setup to limit my speed for fear of lack of self control. I could limit it in software but that is easily changed. Right now I want comfort and range.

This is what i'm looking at right now, just in new 24" rim and spokes single cross for the 5T.

As you can see my 40a controller is up to the task. The speed is 25% to fast, 45-50 kph is the target. A 20" wheel would drop it down to 64.8 kph or use 52V batteries would drop it down to 54 kph. That would be a good trade off.

by neptronix » Aug 31 2021 8:36am

The leaf is still a good choice, 5 years after we discovered it. You can also make a shit ton of torque with the 4T wind which almost does 40mph on 48v. I made more torque with 80A/48v than physics would allow. A low speed winding isn't necessary

Make sure to not get the cassette version because one of the axle sides is weaker than the other in that version. If you want to make high power, you'll want the freewheel version.

I hope all of this helps

by diwhyguy » Aug 30 2021 11:04pm

Hello! I'm trying to find a big hub motor to put on my mountain bike. It's hard to find anything that fits normal dropouts, has room for gearing, and supports at least 2kw.