bike by Eric Hutchinson

[sk8norcal]

http://www.evalbum.com/4206

[Whiplash]

huh, not bad really for such a cheap motor, what are those like $100 for the kit?? How many watts do you think he is actually pulling?? I bet its more than 450...

I really want to do a super cheap assist for my brothers bike, and one of these crossed my mind. He is not interested in going fast, just wants good trail power for cheap. I bet in a 5-7MPH gear that little motor would do pretty well! I can climb some impressive stuff with my build at around 650 watts and I bet that motor would hang with that power, no? A simple bracket off the bottle mount bolts in conjunction with some quality tube clamps would hold nicely and be easily removable too!

[sk8norcal]

what are those like $100 for the kit??

its not a kit, he is using a motor off an Ezip,
Unite Motor MY1018Z

[bzhwindtalker]

why is everyone using youtube stabilization those days? It makes me feel drunker than I am

[coldfusion594]

Hmmm, I'm looking to make a build like this. I am very attracted (not sexually ) to a non hub motor. Looking into motors like these is awesome because less power is needed and extremely efficient because there is the option to use the gears

[Whiplash]

what are those like $100 for the kit??

its not a kit, he is using a motor off an Ezip,
Unite Motor MY1018Z

No I meant the motor/controller kit, not the whole bracket etc.

[stoney]

I like this alot

[hutchtransfer]

Hello, this is Eric, the creator of this ebike. Thanks for posting my videos here! This is my first post to endless-sphere and I am glad that I can contribute something after spending countless hours researching all the forums on this site.

To answer the question about the amps being drawn, I am running a 500W 30A controller. Therefore the current limit is 30A. So 24V x 30A would be 720W, although I rarely pull this much out of that 450W motor. I am quite happy with the results. I just ordered another lipo battery so I will have a 22.2V 24ah pack. Each lipo pack gives me 10 miles of range, so now I will be up to 30miles. Normal cruising is around 16 to 17mph. I have hit 28mph with this motor (wind to my back with a slight downhill grade).

I have changed my Youtube video and took off the stabilization. Must better now!

This was not a kit. I ordered everything online and made the motor bracket out of scrap angle iron.

[ddk]

real clever!
the wind noise on your video was a bit much, so if you might explain how you accomplished mounting the freewheel gear on the MY1018 please
nevermind
would have helped if I clicked the link

the video of the handmade sprocket adapter... thanks for including the grinding part

[JEB]

I would have ground all the teeth off the sprocket (dust shield on shaft, run motor to make it round) then grind a new keyway on the finished dia, to fit a keyway to the aluminum hub id of the freewheel.

Also a 72 tooth sprocket (11.750"od) would bring the crank rpm closer to normal crank speed for the average person, 80rpm~ (5:to1~).

[mrderekcu]

Just wanted to say this bike build gave me a lot of hope for my own. Seeing Hutch's results with that relatively low wattage told me that my goals were not out of the question.

I especially liked that he used a triple chain-ring so he can use the full range of gears, that to me is key in the hilly areas I live in.

Again, awesome build hutch, and good luck to the OP as well.

[hutchtransfer]

I would have ground all the teeth off the sprocket (dust shield on shaft, run motor to make it round) then grind a new keyway on the finished dia, to fit a keyway to the aluminum hub id of the freewheel.

Also a 72 tooth sprocket (11.750"od) would bring the crank rpm closer to normal crank speed for the average person, 80rpm~ (5:to1~).

The crank spins over 100rpm right now, however I seem to get a good range of speed out of this as long as I am in the proper gear. Sadly I don't pedal very much with this set-up except from a stop. I can pedal with this, however I need to put it in a faster gear.

Probably would have been stronger to get a new keyway, however I found my design to be easier to do with my basic power tools at home (grinder, drill, jigsaw, rotary tool). Its hard to get precise cuts without the proper tools.

[hutchtransfer]

why is everyone using youtube stabilization those days? It makes me feel drunker than I am

Yes I agree, which is why I recently took that off! No effects on my video now

[veloman]

This is a nice setup for efficiency and fairly low weight and hill climbing. But the worst part of that motor is the noise. It's a classic whiny electric motor sound, I was laughed at once due to it. It is the gearbox on the motor, not the motor itself, BTW.

If it's really windy or lots of traffic, you won't hear it. But on a quiet residential street you will have people looking up at you from their yard. If it weren't for the noise I would still have my version of this.'


I just watched the video - that choking noise you hear from the motor is because you are overgearing/overloading it. You need to let the motor spin faster in a lighter gear or use less throttle. I wouldn't be surprised if you wear out the motor with it choking like that.

What I also miss is that whole shifting and throttling action, getting the rpm changes sounds cool, even with a whiny motor.

[hutchtransfer]

I just watched the video - that choking noise you hear from the motor is because you are overgearing/overloading it. You need to let the motor spin faster in a lighter gear or use less throttle. I wouldn't be surprised if you wear out the motor with it choking like that.

What I also miss is that whole shifting and throttling action, getting the rpm changes sounds cool, even with a whiny motor.

Yes this a loud motor, however I have gotten used to the sound. I occasionally open up the gearbox and re-lubricate it and this seems to help.

You were right about the choking. This was not the best gear to be in. However I only had one free hand while filming so I could only change the rear gears. I was still in second gear on the front chainring. Under normal circumstances I can tell if I am in right gear by listening to the motor and change gears accordingly. I don't want to burn out the motor!

[jk1]

Why don't you use the quieter xyd16 motor ?

viewtopic.php?f=28&t=33816&p=601358&hilit=my1018#p601358

[veloman]

Hmm, I didn't know there was a quiet version. That would certainly make me want to think about this build again. Maybe try to find a cheap izip on craigslist and the get the motor from it. Prices on these have shot up a lot. I got my my1018z in 2009 for $65.

[mrderekcu]

What kind of chainrings did you use in order to shift?

I installed multiple chainrings on mine, but I just realized that there is a specific design to my previous crank/chainring all-in-one that helps facilitate both up and down shifting. Right now, I have some issues down-shifting due to the smooth faces of the ring.

[veloman]

Why not use chainrings from a multispeed bike? They are ramped on the sides to help with shifting.

[mrderekcu]

The freewheel I used has this 5 bolt pattern that I haven't been able to find on real bike chain rings. At least, not ones that are cheap. I just didn't want to spend over 100 bucks on gears alone. And I was hoping there was a brand that I didn't know of.

[hutchtransfer]

The freewheel I used has this 5 bolt pattern that I haven't been able to find on real bike chain rings. At least, not ones that are cheap. I just didn't want to spend over 100 bucks on gears alone. And I was hoping there was a brand that I didn't know of.

I am in the process of rebuilding my cranks. I will post a video of the process once I receive all the parts. I ordered a heavy duty freewheel from Sick Bike Parts in addition to new freewheel cranks. As for the chainrings, I ordered a Vuelta 22/32/44 crankset from Amazon with removable chainrings for around 40 bucks including shipping. They have a four hole bolt pattern, however I plan to bolt them on to a freewheel spacer I already have. This way I am making my own adapter so this triple chainring will fit on the five bolt freewheel. It is important to find one with removable chainrings instead of those rivets. My old chainrings were taken off a riveted crank and I had to drill holes in the rivets to take them apart, which is not any easy feat. The five rivets almost perfectly matched my old freewheel five bolt pattern, however they required more drilling and grinding.

[hutchtransfer]

Why don't you use the quieter xyd16 motor ?

viewtopic.php?f=28&t=33816&p=601358&hilit=my1018#p601358

I read in a different forum that this motor is quieter but seems to have slightly less power. I'll probably stick to the one I have. The noise is not that bad to me. I recently drilled holes in the motor's casing to help with cooling. Still running mine on 24 volts. I've read that a cooler motor will run more efficently even if you are not overvolting it.