17" moto rim fits 20" bicycle
19" moto rim fits 24" bicycle
21" moto rim fits 26" bicycle - Assumed
https://www.electricbike.com/moped-rims-tires-hubmotors/
I have a 16" x 1.60 steel rim bought it for $50cdn, found a few others recently in the online classifieds, thought about purchasing them, but no need really. HolmesHobby has his last batch of 17x1.60 rims that come to $125cad shipped to Canada. Its a little steep price wise for my liking. I dont mind heavier steel, rusty bits for $50cad. I will lave the 16" x 1.60 into my MXUS 3000W thats still apart, laziness on my part. Get by with my Conhismotor 1500W that I have up for sale locally. I am in no rush to sell it, but perhaps I should be as winters coming and would like cash to buy mid-drive then dont have to worry about rims and spokes and breakage.
What will my 16x1.60 be converted to bicycle wise, I'd guess 18" maybe 18.5" bicycle. Which is perfect for my needs. For the Direct Drive setup, smaller diameter wheel = slower speeds, but my MXUS 3kW is 4T, no worries there. Then I prefer lots of torque for my fat lazy ass, and smaller diameter = shit tons of torque. Please dont confuse a lower Turn Count motor to have more or less of anything compared to a higher Turn Count, just the propogated Myth that Justin talks about here.
http://www.ebikes.ca/learn/hub-motors.html
One false and oft-repeated conclusion is that therefore the 409 is a higher torque motor than the 406 because it can produce the same torque with fewer amps, or likewise more torque with the same amps. This is not the case. All 400 series motors can deliver exactly the same torque at exactly the same efficiency. The lower winding count motors just need more current to do this, but because they have fewer turns of a shorter length of heavier gauge wire, they can handle high currents with minimal loss. To use a concrete example, lets compare a 404 with a 408. The 408 has twice the number of turns than the 404, so the copper wire in the windings has 1/2 the cross sectional area and twice the length, for a total of 4 times the winding resistance of the 404. For a given torque output, the 408 needs only 1/2 the amps, but because it has 4 times the resistance the net electrical loss (I2R) is exactly the same.
Another consequence of having a larger number of turns around each stator is that the voltage induced in the winding by the passing magnets is increased in direct proportion to the number of turns. So for instance, at a certain speed of rotation, the 408 motor will produce twice the back-emf voltage as a 404 motor rotating at the same RPM. To power a motor, the battery pack voltage needs to be greater than the back-emf voltage, and so the 408 motor needs twice the voltage to spin at the same speed as a 404. However, it will only draw 1/2 the current, and you can see that the net power input (Volts * Amps) remains the same.
Also there is a thread here on ES about the Myth, its long, but it mostly makes sense to me now.
https://endless-sphere.com/forums/viewtopic.php?f=2&t=64907&hilit=Myth
Its long. Just read what Justin says, much clearer.
