The Mid Drive Hub as a Non Hub Group

bzhwindtalker

100 kW
Joined
Dec 1, 2008
Messages
1,806
Location
Lyon, France
Hello to everyone here !
This thread is intended to share media about frame-mounted hub motor systems.
7054218109_f04c6c2be2_c.jpg

I just got into those systems, but I already built a functional mid drive and I LOVE it!

It's just so versatile, you have the offroad, the fast street bike and the hill climber on a single setup. The weight of the hub is centered and out of the wheel, meaning the suspension performance is not affected by the unsprung weight, and no fancy $$$ built wheel is needed. The gears let you keep the motor in his happy zone, thus getting a better efficiency if you do a lot of stop and go or offroad. Of course, running the motor through another chain means that you will loose a slight amount of power into transmission losses, but bikes chain are something like 98% efficient.

This is what this particular bikes does on 2000w

[youtube]Wpb2-kHjrTg[/youtube]
 
Love the quote! UNFROCK the possibilities!
 
I thought i would show my face on this thread and found my bike had got here before me!! :D

Got my order in for a V3 CA, that should really make the bike complete!

Simon.
 
Thank you for jumping in Tench! Your build is so clean, I'm jealous of your skill level!

dirt tracker style :
7060001543_26b7cc1759_c.jpg



Weather is horrible today, time to clean up a little bit the bike and paint the hub and supports :(
 
Yes, that member "Nader" is where I got the idea for my mid drive but with the bigger motor. His builds are very clean!
 
subbed! lets see some more vids lads!

ive got my heart set on a twin rewound 80100 setup first, but if that doesnt work out its gonna be a oil cooled mac mid drive next!
 
Awesome video dude ... love how you replace the chain and then jump straight back on :D

Do you think the motor needs a finger/bash/trouser guard, or does it feel safe enough as is?
 
Nice work man! You could probably shave some serious weight off these hub motors since they dont need to support the wheel anymore.
 
I'm looking to shorten the axle to save some weight, and more importantly cut down on the maximum width. Both sides are hollow, one for the wires and the other for a shifting rod. The wiring harness is so tight that I'd rather not replace it, so I can't get it too hot in the shortening process. How would you guys cut it? I'm leaning toward short periods with the angle grinder and cool it off.

Also, what about attaching the sprocket? One side is cast iron/steel that extends to the opposite side of the magnet ring. The wire side is a more typical AL cover, though I think I'd want to reinforce it or turn a new thicker one if I drive off of that side. I'm expecting to run 6-10kw peaks depending on voltage.

Lastly, being quiet is important. I'm looking at a 3:2 possible as high as 2:1 reduction, so what chain and sprockets for a budget oriented guy like me?...the 218 stuff LFP swears by? I was even thinking bike chain at least until I'm sure about gearing, but use chainring size sprockets to greatly reduce the torque load.


John
 
If you have access to a lathe that's how I do mine. Just tie up the wires and carefully cut till thin enough to break off..
 
Whiplash said:
If you have access to a lathe that's how I do mine. Just tie up the wires and carefully cut till thin enough to break off..

If I cut the wires a few inches from the axle, that could work. Thanks for making me revisit the idea of using a lathe. With the phase wires shorted, I might be able to do it just chucking the whole motor in the lathe.
 
Motor bafang BPM 500w
Battery 4 zippy 6s for 44.4 V, 10 Ah
Max speed 50 km/h and 5 Wh/km
http://www.youtube.com/watch?v=ESPSq6J0rfU&feature=player_embedded
 
I miss my velomobile... I really can see how nice a mid driven velo would be!

last mid drive vid for a while, you will understand why at the end of the vid :(

[youtube]Yji8H_Drnfc[/youtube]
 
:( ahh damn what a shame...any chance the frame still has any warranty on it? great bike super agile, hope you get it sorted and get posting more videos soon :D
 
any benefit of using a smaller geared hub motor? Q series or bpm? It would even have more oomph on 48v than a DD...
 
Ha typical USofA
 
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