QS205 50H 6T?

Ok heard back from QS, its 5.5T.
Interesting I didn’t know they made a 5.5, that’s what was confusing me on the RPMs.

Haha started a topic and answered my question :lol:
Hopefully this info can help someone
 

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What is the axle flat width on the 50H?
The mxus 5kw 55H with 150mm o.l.d.

Yeah your picture says its 150mm o.l.d. for the 50H. I wouldnt mind that for the rear of a fat bike, mine is 180mm so an extra long axle would be perfect. The MXUS 3kw 45H is 135-140mm, I had to always spread my dropouts on the Townie when I had the 45H.


Eastwood said:
 
markz said:
What is the axle flat width on the 50H?
The mxus 5kw 55H with 150mm o.l.d.

Yeah your picture says its 150mm o.l.d. for the 50H. I wouldnt mind that for the rear of a fat bike, mine is 180mm so an extra long axle would be perfect. The MXUS 3kw 45H is 135-140mm, I had to always spread my dropouts on the Townie when I had the 45H.

Looks like it’s 220mm axle
Edit: it’s 150 mm for the drop out if that’s what width you were referring to.
 

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markz said:
What is the axle flat width on the 50H?
The mxus 5kw 55H with 150mm o.l.d.

Yeah your picture says its 150mm o.l.d. for the 50H. I wouldnt mind that for the rear of a fat bike, mine is 180mm so an extra long axle would be perfect. The MXUS 3kw 45H is 135-140mm, I had to always spread my dropouts on the Townie when I had the 45H.

Well I guess technically it’s 154 mm for the drop out. See the +4 mm?
 

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999zip999 said:
what's this for why such a slow motor

This is for my Enduro clone build. Went with the 5.5T not the 6T. The reason for a slower motor is this build is more for off-road use, lots of climbing hills. The battery will be 96 V so I’ll still have decent speed. I know a guy with a similar build he has the 205 6T at 100.8 V and he hits 52 mph. (With flux weakening) I should be somewhere in that ballpark, which is plenty fast for what I’ll be doing with this build.

So basically lots of climbing and lots of stop and go through the city. Not much consistent higher speeds mainly stopping and going that’s why I prefer the slower motors. Would build with a 3T if I planned to drive like a motorcycle on the street at consistent fast speeds.

My Mxus 3K is great but I want to push double the power and plus it already gets too hot when I’m climbing massive hills. So the 5.5T winding should help with that plus the QS just being a thicker larger motor can shed heat much quicker.
Yep Hub sinks, F/F, check for QS205! I will push this motor to the max but try to find that balance without smoking it lol.

And look how fast the acceleration is from this QS205 6T, crazy! Love it :mrgreen: :mrgreen:
https://youtu.be/AQgGiAm_3lE
 

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Looks fast enough for me. Like when people buck the trend.

by Eastwood » Sep 21 2021 2:44pm

999zip999 wrote: ↑Sep 21 2021 2:06pm
what's this for why such a slow motor
This is for my Enduro clone build. Went with the 5.5T not the 6T. The reason for a slower motor is this build is more for off-road use, lots of climbing hills. The battery will be 96 V so I’ll still have decent speed. I know a guy with a similar build he has the 205 6T at 100.8 V and he hits 52 mph. (With flux weakening) I should be somewhere in that ballpark, which is plenty fast for what I’ll be doing with this build.

So basically lots of climbing and lots of stop and go through the city. Not much consistent higher speeds mainly stopping and going that’s why I prefer the slower motors. Would build with a 3T if I planned to drive like a motorcycle on the street at consistent fast speeds.

My Mxus 3K is great but I want to push double the power and plus it already gets too hot when I’m climbing massive hills. So the 5.5T winding should help with that plus the QS just being a thicker larger motor can shed heat much quicker.
Yep Hub sinks, F/F, check for QS205! I will push this motor to the max but try to find that balance without smoking it lol.
 
So what is the slowest winding they offer?

I'm willing to go to 72Vnom (20S li-ion 83V max)

but have no interest in "fun" or speed, utility only, all about torque, heavy cargo and steep hills

so looking for a Kv / T-count that yields top speed **under** 25mph, usually in 15-20 range. 26"

DD only in this thought experiment, no gearing.

And OT I know, but some have said to look at 273 for this use case but that's damn heavy per wheel,

or even that the 138 70H may be better than 205 ??
 
OK never mind the link to the motor is a 6T, not 5.5T :lol:
Not sure why they said 5.5 at first but anyways 6T it’s even better for my build.

US $185.50 | QS Motor 3000W V3 72V 550RPM Spoke Hub Motor for Electric Bicycle
https://a.aliexpress.com/_mKgDkPN
 

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john61ct said:
So what is the slowest winding they offer?

I'm willing to go to 72Vnom (20S li-ion 83V max)

but have no interest in "fun" or speed, utility only, all about torque, heavy cargo and steep hills

so looking for a Kv / T-count that yields top speed **under** 25mph, usually in 15-20 range. 26"

DD only in this thought experiment, no gearing.

And OT I know, but some have said to look at 273 for this use case but that's damn heavy per wheel,

or even that the 138 70H may be better than 205 ??

The 6T could be a good option for cargo purposes. They don’t have a 7T listed but I’ve heard of it before.

But yeah you could run high voltage and low current and the motor should run cooler. You could turn up the current for larger hills and heavier loads.
 
Now i'm wanting one, $185 + shipping. About the same price as a leafmotor. Never wanted a 3 or 4T. If I could keep my top speed 30 mph or lower at 72V would build a custom rear fork for it.

Why is the idea that lower voltage and more amps are better. After finding that 10yr old thread i'm not so sure any more.

Nice job Eastwood!
 
ZeroEm said:
Now i'm wanting one, $185 + shipping. About the same price as a leafmotor. Never wanted a 3 or 4T. If I could keep my top speed 30 mph or lower at 72V would build a custom rear fork for it.

Why is the idea that lower voltage and more amps are better. After finding that 10yr old thread i'm not so sure any more.

Nice job Eastwood!

QS can also custom build you one it only takes about 10 days to build. Probably would cost more though.

Yeah at 72 V with their 6T that should put you around 30-ish-mph. My mxus 3K 5T hits is around 35 without flux weakening, with flux weakening I can hit 50 mph when it’s charged at 84 V. But the mxus might be a 6T because when I change the bearings it had a marking of 6 on the inside, who knows lol.

Yes $185 + shipping is a great price for this motor! Especially because it’s a V3. The only thing it’s lacking is the new integrated wiring that comes out of the axle but screw it, it’s cheaper and has same performance. Probably will put some extra heat shrink where it comes out of the axle to prevent cutting into the wires. Their newest version is V3TI and there’s a V3I as well. Basically just different ways the wires come out of the axle but they’re all V3’s. Took me a while to figure out that part because they were so many dang options :lol:
 
To much motor for me, and to answer the question I just have a Leaf 6T 35H "1500W" which suits my needs just fine. I probably could go with a 7 or 8T for the speeds I ride and the occasional w.o.t. I do.
 
Your days of over heating would be in the past. It's the width of the motor and no gears, the chain line would be terrible. I would need it geared for the road 45 kph. Would not joy ride on the trails with it.

by markz » Sep 22 2021 12:51pm

To much motor for me, and to answer the question I just have a Leaf 6T 35H "1500W" which suits my needs just fine. I probably could go with a 7 or 8T for the speeds I ride and the occasional w.o.t. I do.
 
It is good to have a limit because its human nature to get used to going faster and faster and faster.
52V is to much for me, which means 48V is to much for me which leaves me with 36V but its good to have the extra watts of power to get up hills because the extra weight for me really hikes the power used. That extra power needs to come in an increase of volts or amps or both. If I wanted 2000W at 36V I'd need a battery 10S 55A but at 14S (52V) is only 39A. The smaller the Ah battery, the higher the discharge current has to be for the 18650's. PF's are 8-10A and 25R's are 20A, per parallel string. The closer you are to hitting that max, the faster the degradation. Like everything there is a balance.

Then theres the whole thing of controller continuous power and controller max power, and how long does max power take place. My generic Greentime 36V 35A controller doesnt specify a A(max).
 
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