QS273 40H Smallest wheel

A

Audisport09

100 W
Joined
Jan 31, 2020
Messages
159
Location
UK
Hello, I'm looking to buy 273 40h in the smallest wheel possible but with freewheel and 150mm mounting. Has anyone managed to lace it into a 16'' wheel? I've seen it 14'' cast but they are all for motorbike, no vendor on aliexpress is willing to modify it for me or even just sell me the cast wheel without the motor.
 
I’m in the process of building a QS205 in a 16 inch wheel. Yes it’s possible but you’ll need a motorcycle rim with angled spoke holes. If you stick with 12 gauge moped nipples you should be able to manage the horrible spoke angle. But if you lace the rim with motorcycle 8 gauge spokes the thickness of the nipple is too much for the angle.

But I’m not sure is the QS 273 flange bigger?
Why do you need the heavy 273 anyway? Do you plan on pushing 20+KW?
 
I can relate with wanting the 273mm diameter stator.

"20inch" BMX bicycle rim size happens to also be "16inch" motorcycle rim size.

I think that 20inch BMX size cast on the OD of the 273mm stator is about the smallest diameter you could fit.
 
Yes the bicycle measuring system is terrible, motorbikes got it right. I'm hoping to archive more torque thrust. I already have two QS205. One is having issues, possibly too much power.

I have an A2B in a 16'' wheel running BAC8000+lipos
bibike.JPG

The other in a DIY 12'' wheel running a weaker sabvoton 150a + lipos.
bikesss.jpg
Off the line this setup feels like it has way more torque. Maybe its a wheelbase/geometry/weight thing. I like a bike that threatens to throw you off, I'm not getting that with the A2B.

I've seen a guy mange it in a 17'' I don't know how to lace heavy hub motors , and finding someone that does is going to be tricky/expensive.
196379924_4884264318255218_5278678402216314177_n.jpg

Qs have managed to fit in in a 14''
Screen Shot 2022-02-08 at 04.11.56.png
But that motor is 200mm and no bicycle attachments. I've been asking them if they sell just the cast wheel but no dice. 'Complete motor only'' Life is too short, Ideally, I want to move away from spokes maintenance. Looking a suitable wheel.
 
Well I've sort of done it. After a lot of spamming, I finally managed to get a vendor to sell to me 1 piece QS273 40H + motorbike style QS273 cast wheel without the motor.

The side cover match with the 40h, so they could easily accommodate people who don’t want spokes.
IMG_3287.JPG
IMG_3289.JPG


I briefly thought about gutting my new motor and transferring the magnets over. It would have been stronger and nicer looking. But a quick read on here and I didn’t fancy the challenge of centralising and ungluing/gluing jumpy strong magnets.

After some angle grinding/drilling + M5 bolts + Jb weld professional size.…here is the result.Not pretty at all, but seems solid enough, spin relatively straight.
IMG_3296.JPG

Put a 80/100 14 tyre, tallest I could find. Front has a 80/90 16 hoping to change to a 80/70 for slightly better geometry in the future.
Screen Shot 2022-03-24 at 19.24.37.png
Screen Shot 2022-03-24 at 19.31.05.png


Based on my bathroom scale the QS205 was around 15kg all in. This QS273 is 22kg all in. I’ve gained 7kg of extra motor weight. Which is not too bad I hope. Splash of paint, jobs a good'un. Not tested, waiting to get ASI reprogrammed. Fingers crossed for some serious torque.


Bike.jpg
 
Why such a large, heavy motor on such a weak and small bicycle frame? That motor can take 30+kW and go >100mph...
 
Audisport09 said:
Fingers crossed for some serious torque.
Bike.jpg
Click to expand...

What winding do you have? Hopefully you don't have a 3T winding looking for big torque off the line. Interested to see how your motor turns out, keep us updated :thumb:
 
SlowCo said:
Why such a large, heavy motor on such a weak and small bicycle frame? That motor can take 30+kW and go >100mph...
Click to expand...

Why? Because l’m addicted to e-power :). The frame is relatively strong and heavy, It is not one of those china special. The change in motor is partly about me want more torque not speed and also I was having intermittent issues with the QS205/ ASI controller combination. Not sure which one is the culprit. Doing some problem solving by elimination, so thought why not change it up.

Eastwood said:
Audisport09 said:
Fingers crossed for some serious torque.
Bike.jpg
Click to expand...

What winding do you have? Hopefully you don't have a 3T winding looking for big torque off the line. Interested to see how your motor turns out, keep us updated :thumb:
Click to expand...

I not sure what windings they sent. Can you understand this? QSWP724000W 220305 1091050. Anyway I asked for 3T. Based on my understanding they all perform the same. Some need higher volts and some need higher phase amps of which I have plenty with lipos and BAC8000.

skeetab5780 said:
Those front chainwheels(sprockets) are freaking hilarious! BA bikes
Click to expand...

Lol yeah 70T! still not big enough, curse of having small wheels
 
Audisport09 said:
I not sure what windings they sent. Can you understand this? QSWP724000W 220305 1091050. Anyway I asked for 3T. Based on my understanding they all perform the same. Some need higher volts and some need higher phase amps of which I have plenty with lipos and BAC8000.
Click to expand...

Yeah there’s a big difference between the windings. With QS motors they offer 3T, 4T, 5T, 6T

The 3T motor is good for top speed. It’s not efficient at stop and go or does it have a good acceleration from a standstill. That motor shines once you’re going over 15 or 20 mph. The 3T also can get really hot in stop and go traffic as it’s meant to be held wide open, so it’s best for commuting.
The top speed of the 3T winding @ 72v is around 70mph

Then compared to the 6T it’s all about acceleration. This motor has really hard acceleration but it lacks top speed. With the 6T it runs more efficient at stop and go and has the fastest acceleration of all the windings.
The top speed of the 6T winding @ 72v is around 40mph

Now all this being said you can still get decent acceleration out of the 3T but it takes way more amps compared to the slow wind motors like the 6T or 5T.

I can give you a example from my own personal experience with two different QS205. One is a 5.5T which is an odd winding and then my other motor is a 6T. There’s a massive acceleration difference just from 1/2 a winding. So comparing the 3T vs 6T is literally night and day difference for acceleration and top speed.

Unfortunately there’s a lot of misunderstanding about the motor windings. In fact when I first started building E bikes I was instructed the same that the 3T is the same performance, couldn’t be further from the truth.

Maybe QS would sell you a new stator with a 6T winding or if you have the skill you could rewind the motor but it’s a lot of work. Also with the 6T winding we typically have to special order it because their most popular sellers are the 3T, 5T so those they keep in stock.

Here’s two videos to my Enduro frame which has a 6T winding laced in a 16” rim. You can see it has good acceleration off the line. The controller was set at 150 DC amps. My controller goes up to 250 DC amps but don’t think it’s possible to go full throttle without looping out into the sunset lol
https://youtube.com/shorts/oDLMKu5hdIQ?feature=share
https://youtube.com/shorts/YiVQHncTpRA?feature=share
 
Eastwood said:
Audisport09 said:
I not sure what windings they sent. Can you understand this? QSWP724000W 220305 1091050. Anyway I asked for 3T. Based on my understanding they all perform the same. Some need higher volts and some need higher phase amps of which I have plenty with lipos and BAC8000.
Click to expand...

Yeah there’s a big difference between the windings. With QS motors they offer 3T, 4T, 5T, 6T

The 3T motor is good for top speed. It’s not efficient at stop and go or does it have a good acceleration from a standstill. That motor shines once you’re going over 15 or 20 mph. The 3T also can get really hot in stop and go traffic as it’s meant to be held wide open, so it’s best for commuting.
The top speed of the 3T winding @ 72v is around 70mph

Then compared to the 6T it’s all about acceleration. This motor has really hard acceleration but it lacks top speed. With the 6T it runs more efficient at stop and go and has the fastest acceleration of all the windings.
The top speed of the 6T winding @ 72v is around 40mph

Now all this being said you can still get decent acceleration out of the 3T but it takes way more amps compared to the slow wind motors like the 6T or 5T.

I can give you a example from my own personal experience with two different QS205. One is a 5.5T which is an odd winding and then my other motor is a 6T. There’s a massive acceleration difference just from 1/2 a winding. So comparing the 3T vs 6T is literally night and day difference for acceleration and top speed.

Unfortunately there’s a lot of misunderstanding about the motor windings. In fact when I first started building E bikes I was instructed the same that the 3T is the same performance, couldn’t be further from the truth.

Maybe QS would sell you a new stator with a 6T winding or if you have the skill you could rewind the motor but it’s a lot of work. Also with the 6T winding we typically have to special order it because their most popular sellers are the 3T, 5T so those they keep in stock.

Here’s two videos to my Enduro frame which has a 6T winding laced in a 16” rim. You can see it has good acceleration off the line. The controller was set at 150 DC amps. My controller goes up to 250 DC amps but don’t think it’s possible to go full throttle without looping out into the sunset lol
https://youtube.com/shorts/oDLMKu5hdIQ?feature=share
https://youtube.com/shorts/YiVQHncTpRA?feature=share
Click to expand...

Oh man it’s all so confusing, too late now, maybe next motor lol. I tend to do most of my riding on the road so the higher top speed might not be so bad.
 
Audisport09 said:
Oh man it’s all so confusing, too late now, maybe next motor lol. I tend to do most of my riding on the road so the higher top speed might not be so bad.
Click to expand...

Well considering you have a bac8000 with Lipo’s just run more current :thumb:
How many amps are you running when you did your testing with the new motor? The QS273 can handle lots of power. I mean even with the QS205 I know people that run 200+ DC amps without overheating, obviously being cautious with the heat build up. In your situation with the big QS273 you could run a lot more than 200A without overheating :thumb: just keep a close eye on those temps. Also with your smaller wheel diameter that’ll definitely helps with off the line acceleration/torque.
 
Audisport09 said:
Well I've sort of done it. After a lot of spamming, I finally managed to get a vendor to sell to me 1 piece QS273 40H + motorbike style QS273 cast wheel without the motor.
Click to expand...


I would love to know who you got this from. I also have a A2B frame and 273 on a 19" moto wheel that obviously is too big :D


Audisport09 said:
After some angle grinding/drilling + M5 bolts + Jb weld professional size.…here is the result.Not pretty at all, but seems solid enough, spin relatively straight.
Click to expand...

If you have any more details about this process; would be great to know.
 
I steer fine in wheelies.

I think it's an excellent motor for the bike. For some folks, there is no such thing as 'over-motored', just the largest one you've been able to make fit so far.
 
That is from a man who e-bike or Frankenstein bike is called or I should say is named the death bike.
I would love to see that thing in action and I don't mean me riding it.
 
Yea he got that so hot on a Riverside go-kart track that when he came in he took a 4-in grinder cut the motor in the top cut the motor in the bottom and flooded with water to cool it off for the next race there you go my boy Luke !!!
 
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