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Unicycle frame design

Started by Erant · · Last activity · 5 posts · 272 views

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rec.sport.unicycling
Published
14 November 2005
Last activity
10 November 2006
Original author
Erant
Posts
5
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Public discussion
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Electronic shifting

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  1. Original post
    Erant
    Archived post
    #1

    My brother recently bought a coker, and I'd like to ride with him. But
    he has a job, and thus money. I'm a poor student, but I have access to
    welding equipment, and metal. I also have a spare hub, seat, seatpost,
    cranks and pedals lying about. So I figured I'd construct myself a 29
    inch frame, get a 28 inch rim off an old bike, and build myself a nice
    29'er. Now, first things first, I need a frame to bolt all my bits and
    pieces to. I've taken a few quick looks at my trials uni, and at the
    coker frame. Ofcourse, there are two obvious differences. For one, the
    coker has a curved crown( /\ ), and the trials has a flat crown ( |-|
    ). Are there any advantages/disadvantages to either design? I also
    noticed both uni's have a slight widening at the base of the pipe where
    the seatpost goes in, why is that? The rest seems pretty
    straightforward, and I should be able to quickly assemble it, and start
    practicing for the 10km in Unicon 😉

    --
    Erant

    Live free, prosper, and under my rule.
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  2. johnfoss
    Archived post
    #2

    You might be able to buy a Coker (or 29"😉 frame pretty cheap from
    someone who has upgraded, or otherwise from anyone trying to get rid of
    one. This might be worth looking into unless you really want to get
    your hands dirty and build your own.

    Crown shape is a more a matter of manufacturing method than much else,
    unless you're getting into high performance. Build whatever will hold
    up and be rigid. I'm not sure about the widening at the base of the
    unicrown forks, but the think to keep in mind is you want your seat
    tube to be the right size size for your seap post. You can't just
    narrow it down for an inch or two where the clamp is (like on Miyata
    giraffes), or you'll create a weak spot.

    The easiest approach may be to build from an old bike fork. That will
    cover the crown part, and you'll just have to figure out the bearing
    attachment (and maybe length), and possibly modify to fit the right
    seat post.

    --
    johnfoss

    John Foss, the Uni-Cyclone
    "jfoss" at "unicycling.com" -- www.unicycling.com

    "Read the rules!" -- 'IUF Rulebook'
    (http://www.unicycling.org/iuf/rulebook/) -- 'USA Rulebook'
    (http://www.unicycling.org/usa/competition/)
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  3. munipsycho
    Archived post
    #3

    I think you can buy a new 29" Sun for around $90. I don't know if you
    could build one much more cheaply than that.

    Then you can upgrade it as you go. I rode one for several months. It's
    a pretty fun ride - and fast with 102s.

    --
    munipsycho

    ================
    'Feed the Happy Wolf!' (http://www.birdknob.com/two_wolves.jsp)
    'Munipsycho.com' (http://www.munipsycho.com/)
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  4. gordito8me
    Archived post
    #4

    look at the torker ax unicycle. It comes in 29'' and they're super
    light. And about the crown flat crown or rounded doesn't matter on a
    29er unless you want to go one footed then make it rounded. but also
    keep in mind how big of a tire you want to fit. Especially if you're
    going to use it for muni.

    --
    gordito8me
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  5. maximus unius
    Archived post
    #5

    Its not out yet.

    --
    maximus unius

    Quoted message said:


    Originally Posted by *Brian MacKenzie*
    Have you tried rubbing your nipples with grease before twisting them so
    tightly?


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