Torque Arm Build

Discussion in 'Electric Bicycles' started by JFleck, Mar 2, 2007.

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  1. JFleck

    JFleck Guest

    Hello All,

    Here's my build for the torque arm for any electric motor. I am in the process
    of installing a 48V electric hub motor on my bike. many of these kits
    don't come with a torque arm, so here's a quick tutorial to make
    your own.

    TOOLS: you will need a drill, hack saw or cut off wheel, round file and a flat file.

    1. Start with some steel stock that can be purchased at Home Depot or any local
    hardware store. I got this one at Home Depot for $4.00 I think. This is 1/8in thick
    steel, nice and sturdy and easy to work with.


    2. Cut off the amount needed, keeping in mind that the leverage
    comes from how long the piece is. I cut mine to 8in. Take one of the
    washers that came with your kit and use it as a template for your hole.
    drill 2 or more pilot holes making sure they are inside of your drawn hole,
    then use your files to shape out the hole.


    As you get closer to the drawn hole start trying to fit check the torque
    arm. you want to have as snug a fit as you can.


    3. When you get your hole filed to size where it is nice and snug, install it on your hub.


    I installed mine on the inside of the fork, basically replacing the
    washer that would be there.


    4. Mount your wheel and from the other side I mounted the
    torque arm with 2 size 10 self taping screws. you can also use hose
    clamps or other methods to attach the arm.


    5. The final mount will look something like this, I painted and shaped
    my torque arm a bit to match my bike and paint, but you can make the
    install look as clean or dirty as you want to . . .


    Hopefully this is a helpful tutorial to those of you taking
    the "ELECTRIC" route for your bike . . .

    Take Care All,


  2. srdavo

    srdavo Active Member

    Nov 4, 2006
    Likes Received:
    I remember when Blaze spun his axle....and his fix! very nice. the dude knows his stuff!
    your post, however...
    takes the specific problem, from a preventative aspect, to the cure, in an easy to follow tutorial. is your last name Chilton? :lol:
    awesome job !!
    I am trying to develop some basic installation pictorials here, for the chinese engines. with your permission, I'd like to borrow from your tutorial style. (& I'm not too proud to take some advice....or some help) 8)

  3. JFleck

    JFleck Guest

    Knowledge is free . . .

    Knock yourself out,

  4. davidsis

    davidsis Guest


    Hey, what is the best electric kit for a bike? The most bang for the buck, and should I get batteries at an automotive dealer? If so what kind should I get?
  5. azisme

    azisme New Member

    Jun 8, 2008
    Likes Received:
    Need Pictures

    I realize this is an old post, but it seems to have some valuable information in it... if only the pictures were still there. JFleck, are you still monitoring this? Anyone else able to help out with this? This should be sticky'ed if the pictures can be reproduced.
  6. ozzyu812

    ozzyu812 Member

    Apr 6, 2008
    Likes Received:
    this is most likely why no img tags are allowed anymore
    i would have liked to see them too
  7. JFleck

    JFleck Guest


    Hey guys been awhile since I have been on the site and saw these pics were gone so i'm reposting them . . .

    They are in the same order as the above guide I couldn't figure out how to edit that post to re add them . . .



    Attached Files:

  8. AussieJester

    AussieJester Member

    Nov 25, 2008
    Likes Received:
    nice job...for those without access to tools a couple of ring spanners or open ended spanners from the local hardware held in place with hose clamps do the trick ;-)



    actually yes they are as long as image size isnt excessive, the rules were 'made clear' a few months back now when it
    was bought to light, the rules never said they were not allowed but people like myself that posted img tags got a few pics deleted, admins came to the party and bought the forum into the modern age LoL..
    Last edited: Dec 9, 2009