Help required on choosing a 3k rear hub motor

hi I am currently in the process of building my first ebike (stealth clone)
I was originally going to use a full sus 29er DH frame however for reasons unknown the frame only made it as far as clearing uk customs when the shipping was cancelled that set me back 2 months
I started planing this build back in January and have spent a great deal of time either watching builds on you tube and reading a lot of posts on here

If I have got this correct then not all motors are created equally ie the more windings or turns in a motor the greater the torque and acceleration but lower top speed
I've decided to go with a 3000w motor and narrowed my search down to these 2 motors linked below as far as I can tell they are both similar of specs

So other than the price is there any reason to choose one over the other or perhaps I've missed something and these motors are not of similar specs
I would appreciate some help or suggestions as I am struggling to understand why one Motor is considerably more expensive than the other

https://a.aliexpress.com/_m0cYJPj
QS 205 3000w Motor (50H) V3
￡154.85 + £122.28 shipping

https://a.aliexpress.com/_mMUdR4V
MXUS 3K TURBO
￡240.17 + £186.95 shipping

Welcome to the forum!

Buy the QS205,great motor 3.5T winding is good.
Make sure the dropout width is suitable on your frame
What controller, battery and bms are you thinking of using?


Jonno

One thing to consider the QS motor is much heavier. That being said you’re using a stealth frame so you could handle the weight. I was in a similar situation contemplating both these motors and I went with the mxus because it’s lighter. My situation I’m using an actual mountain bike frame so that’s why I went with the lighter motor.

Thanks

The rear dropout on the swingarm is 175mm
Strange I still had it in my mind I required 150mm as that was from my intended mountain bike frame

The batteries are the Eig co20b 20 ah cells
I have 30 of these cells to make a 15s 2p pack but the frame has enough room that I could add more
Purchased from a seller here on the forum
https://endless-sphere.com/forums/viewtopic.php?f=31&t=102908

I haven't bought the bms yet but am considering https://a.aliexpress.com/_mL2qUdx
It's a 7 - 20s smart bms probably the 300amp version the cost between this and the smaller amp version is minimum

For the controller I had thought to use the sabvaton SVMC72150

I have also looked at putting the motor in to 19inch motorcycle rims rather than use mountain bike ones I realise this will add more weight to the bike but I figured the motor will be doing most if not all the work and these should cope better

For that bike, QS205 all day long.

Haggis_Basher said:

I have also looked at putting the motor in to 19inch motorcycle rims rather than use mountain bike ones I realise this will add more weight to the bike but I figured the motor will be doing most if not all the work and these should cope better

Click to expand...

As long as you're OK with the trade-offs. For performance, it's the absolute worst place to add additional weight. Rotating mass is stored energy. If the location of the mass, relative to the axis, is around the perimeter (ring), rather than evenly (disc), the stored energy of that rotating mass can more than double. The stored energy comes from the motor. That energy is energy that would otherwise be used to propel the bike forward. Acceleration will suffer, and brake pads will wear out more quickly.