Side mount 36V 900W Sprocket design

Discussion in 'Electric Bicycles' started by Dockspa1, Dec 30, 2007.

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  1. Dockspa1

    Dockspa1 Guest

    Man, I just recieved my stuff from an auction I won on Ebay. It consisted of a 36 Volt, 900 Watt motor, 900 Watt 36 Volt controller, a complete wire harness including the tail and turn signals for less than $40.00 including shipping.
    This will be a first for me rigging a side mount up instead of the hub mount.
    It was used but guaranteed.
    I have 3 12 Volt 20AH batteries to hook up. (Salty).
    Am thinking of making a wild 12.5 inch wheeled ebike out of one of my old 26"ers. Thus, no need for any regearing or giant shieving. Might have to extend the legs on the bike in order to be able to pedal all the way around without hitting the ground.
    I weigh in over 250 lbs and my wifes hub motor with 24 volt pushes me around fairly well so, I am hoping that this 36-900 will push me around with ease.
    Has anyone ever tried this before?
    Will probably look funny but when you look like me, you just don't care as much about looks any more. I'm more interested in traveling far and silent like a stealth. Ha Ha!
    Any info would be appreciated. :grin::smile:

  2. srdavo

    srdavo Active Member

    PICS man....we need pics! :lol:
  3. fetor56

    fetor56 Guest

    900W....couldn't u get anything bigger. :) sounds like a powerhouse and i would be interested to see any pics.
  4. TheBadBunny

    TheBadBunny Guest

    I, too, would be interested in seeing pictures of this "side mount" kit and how it's set up. I have a motor taken off an old Currie Mongoose ebike, and I've been looking for some way to use it on another bicycle. It ws also a side mount. It mounted on the left side of the bike, and the rear wheel had freewheels on both sides, one for the pedals and one for the motor. The problem was that special hub was rather cheaply made and tore up very easily, and after replacing it three times in only about five months, I just couldn't afford to keep using it. If you can, please post a post-setup picture!

  5. Alaskavan

    Alaskavan Guest

  6. Dockspa1

    Dockspa1 Guest

    I understand the interest but give me some time to put it together. Don't know if I should keep the # 25 chain or go bigger. They use these motors on the newer electric scooters that look like the honda 250 cruiser scooters.
    I'll get some pics of the parts maybe tommorow.
  7. TheBadBunny

    TheBadBunny Guest

  8. Alaskavan

    Alaskavan Guest

    Robert, I'll PM you, I don't want to be steppin' on Doc's thread too much. It looks like it may get pretty interesting.:cool:

    Looking forward to the pics Doc.:grin:
  9. Dockspa1

    Dockspa1 Guest

    It's all good Van.
  10. Dockspa1

    Dockspa1 Guest

    So far not much to see. Here is the beginnigs.

    Attached Files:

  11. Alaskavan

    Alaskavan Guest

    That's a nice pile of stuff to start off with. My imagination started taking off just lookin' at it. Cool.
  12. TheBadBunny

    TheBadBunny Guest

    Doc's motor

    That's a Unite motor 1020. I believe it's actually 750 watts, not 900, and looking at the wheels, I'd guess it came off of an electric scooter. How are you going to make it freewheel when it's not running?

    BTW, my motor is is a Unite 1018. Never had a problem with it, just with that $%^&* rear hub.

  13. Dockspa1

    Dockspa1 Guest

    You might be right. It states 900 Watts on the label but sometimes you can't go by that. Well, since it's been in the teens here and I really can't afford to heat my workshop just to play, I'm kinda stalling. It's supposed to get up in the forties in a day or two.
    Haven't given it a lot of thought as to the freewheel but I did order a longer axel hopefully with enough room to mount the other freewheel. I do have the controller for the motor. I forgot to check rotation direction on the motor.
    Worse case scenario, it will become an electric bike with little wheels and no pedalling, oh, and a big donkey riding it. Ha Ha!
    Last edited by a moderator: Jan 3, 2008
  14. Dockspa1

    Dockspa1 Guest

    After doing a little research, found that the unite 900 is reversable by changing the polarity. Thats a relief.
    Badbunny, why does it make a difference that they are scooter wheels? They have the high speed bearings in them. It still can be set up for a 14MM standard axel.
    Any offerings from the grey matter will be apreciated.
    Last edited by a moderator: Jan 3, 2008
  15. TheBadBunny

    TheBadBunny Guest

    I'm just wondering how you're going to make both the pedals and the electric drive freewheel.

    If you reverse the polarity of the motor and use it on the left side of the bike to drive the rear wheel, I see some problems (which I'm sure you've already thought of), and I'm just wondering how you're going to overcome them, because I'm interested in a similar project. (I'm assuming here that the wheel's sprocket is meant to be on the right side, as with most scooters.) The first is that the freewheel on the wheel only freewheels in one direction. If you flip the wheel over so that the sprocket is on the left side, it's going to freewheel in the opposite direction, i.e., the direction that the motor is spinning. Second, I doubt that scooter hub will be threaded for a bicycle freewheel to allow the pedals to freewheel.

    Regarding the wattage of the motor, a lot of manufacturers rate their motors according to their peak watts, not their continuous output watts. The motor I took off my Currie electric bike has "450 WATTS" all over it. It's actually 250 watts continuous output, 450 watts peak.

    Last edited by a moderator: Jan 3, 2008
  16. Dockspa1

    Dockspa1 Guest

    Well, the only thing I was thinking to do was to , keep the scooter wheel the same drive side and if possible reverse the 3 piece crank for the pedals and instal circlips to keep the left to right hand threads stable in their opposite positions. With a 14 mm shaft, I can find unlimited freewheel sprockets for the pedal side.
    As far as the Wattage goes, even at 750 Watts that still equals one horsepower and that should be plenty to push me around. I will be installing an ampmeter and will be more able to give you an exact number based on constant outputs.
    Thanks for your input and feel free to add more.
  17. retrophoto

    retrophoto Guest

    I'm not as smart as the other people here but since you have all the electronics that match the motor, I wonder if one of those large sprockets from a gas engine kit wouldn't just bolt up to your rear bike wheel. It would sure be an easy connection. If it would work that is.

    The chain might not work I guess. I have made friction drives out of those engines. I have two on a huffy cruiser but not nearly that large. a 250 and 350 watt both driving the rear wheel.

    Anyway it looks great and like a great deal.
  18. Dockspa1

    Dockspa1 Guest

    Well after some more thought, I believe I can add an identical freewheel on the other side and weld a rear bicycle sprocket to it. You can't flip the freewheel or you will be locked up. I'll check into it further.
    Spent all day installing a scooter seat on my wifes E-trike. Scooter parts are cheap.
  19. Dockspa1

    Dockspa1 Guest

    Wow, Retro, you mounted both motors on one rear wheel? Got any pics? Sounds awesome.
  20. TheBadBunny

    TheBadBunny Guest

    Freewheels don't screw onto the shaft. They screw onto the hub.

    There's a way around all this, of course. You can smell it. But I think you're right, it's going to require welding.