Drive Roller: Noob Help

Discussion in 'Motorized Bicycle General Discussion' started by physic.dude, Dec 15, 2009.

  1. physic.dude

    physic.dude New Member

    Joined:
    May 31, 2009
    Messages:
    12
    Likes Received:
    0
    I just finished my motorized bike (electric) recently, and the drive roller I used was a polyurethane skateboard wheel with the steel nut epoxied in with 2 part epoxy, the nut came with the motor (reversed threads).

    Anyway the bike worked outstanding (20.2 mph tops). But sadly the epoxy started to give away and the wheel was barely hanging on.

    So, I am just asking if someone can direct me to a site with well made (cheap) drive rollers, preferably metal with deep grooves so it won’t slip in wet conditions.

    Here are the specks of my motor axel,
    Total shaft length - 1" (back 1/2" circular, and front 1/2" reversed threaded w/ flat side)
    Shaft diameter- 1/4"
    Skateboard wheel diameter - 2 1/8"

    ***I cannot go any larger or smaller with the roller diameter… the motor is not adjustable.***(presure of the roller on the tire is just perfect)

    Thanks
     

    Attached Files:

  2. Elmo

    Elmo New Member

    Joined:
    Sep 3, 2009
    Messages:
    749
    Likes Received:
    0
    The roller is going to slip when it is wet unless it is made of something like sandpaper with a lot of down pressure and it will eat your tire. Second thing get a smooth tread tire and it will work better.
    Elmo
     
  3. physic.dude

    physic.dude New Member

    Joined:
    May 31, 2009
    Messages:
    12
    Likes Received:
    0
    Well I guess a polyurethane wheel will work best then.

    Does anyone know of a place online where I can get one on the cheap?
    (2 1/8")
     
  4. xlite

    xlite New Member

    Joined:
    Jun 18, 2009
    Messages:
    736
    Likes Received:
    0
    My first MB was friction and I built several DIY and I can tell you what Elmo says is true. Also note that plastic and wood rollers do not last at all if you plan on putting thousands of miles on like I did. Also note that JB weld and epoxy do not work for mechanical assemblies like we deal with here.

    The best roller is made from a 2" piece of 1 1/4" OD iron pipe with wood cylinder wedged inside. $2 a foot and lasts for years.
     
  5. physic.dude

    physic.dude New Member

    Joined:
    May 31, 2009
    Messages:
    12
    Likes Received:
    0
    I wouldn’t ride this bike for that many miles, a polyurethane wheel is fine.
    Does any one know where I can get one?
     
    #5 physic.dude, Dec 15, 2009
    Last edited: Dec 16, 2009
  6. physic.dude

    physic.dude New Member

    Joined:
    May 31, 2009
    Messages:
    12
    Likes Received:
    0
    I need this rollerASAP
    Anyone? please...
     
    #6 physic.dude, Dec 16, 2009
    Last edited: Dec 16, 2009
  7. physic.dude

    physic.dude New Member

    Joined:
    May 31, 2009
    Messages:
    12
    Likes Received:
    0
    As you can see, I am desperate for this roller!!!!!!!!!!!!!1

    :-|| :-|| :-|| :-|| :-||
     
  8. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

    Joined:
    Mar 20, 2008
    Messages:
    6,174
    Likes Received:
    18
    Maybe you could use a large diameter 'stunt peg' from a BMX bike?
     
  9. Elmo

    Elmo New Member

    Joined:
    Sep 3, 2009
    Messages:
    749
    Likes Received:
    0
    Go to your local hardware store and look at their caster wheels and truck wheels. These are not for a truck they are small diameter heavy duty wheels to put on something heavy so you can roll it around. They should have something close to the diameter you want. Also there is a thread one here that said there is more than one kind of skateboard and some of them are good for friction drives.
    Elmo
     
    #9 Elmo, Dec 16, 2009
    Last edited: Dec 16, 2009
  10. freewheeling frank

    freewheeling frank New Member

    Joined:
    Mar 10, 2009
    Messages:
    440
    Likes Received:
    0
    second hand stores
     
  11. physic.dude

    physic.dude New Member

    Joined:
    May 31, 2009
    Messages:
    12
    Likes Received:
    0
    Update:

    I was trying to make another roller by melting the steel nut to the skateboard wheel... didn’t work too well. Something happened when I was trying to get the nut off the motor and the threads on the motor are totally mangled. So now my only options are to epoxy a roller to the motor permanently, or try to find a purpose built roller that has little set screws in it that clamp down on the axel,
    look at attached picture, (this one is 1.5")
     

    Attached Files:

Share This Page