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Mini Giraffe.

Started by juggle508 · · Last activity · 4 posts · 332 views

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rec.sport.unicycling
Published
23 June 2005
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24 June 2005
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juggle508
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  1. Original post
    juggle508
    Archived post
    #1

    After look at online pics, i have decided to build my own mini giraffe.
    Im using pieces of an old bike. I want to put a push- lawnmower tire on
    there. Probably be about 10" or so. Might be bigger if that would help.

    I am stumped on a sprocket question though. The top sprocket is going to
    be the front sprocket of the 20"bike i am using. I got a problem though
    with the bottom sprocket. How big should it be? I was going to use the
    back sprocket off the bike but it was a multi-speed and all the
    sprockets are together as one piece.

    Also, how will i attach the bottom sprocket to the lawn mower wheel?

    I also need help with the frame. SHould i use the bike frame and chop it
    up so i will already have the crank shaft (?) or should i make a custom
    frame??

    Looks like i got my work cut out for me.

    Kelly.

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  2. UNIquelyCanadian
    Archived post
    #2

    Have you considered using a very small children's bike for the wheel? It
    seems to me that a lawnmower wheel would be incompatible with the
    design? I'm sure you could find a cheap kids bike with a 12" wheel, then
    use the bottom sprocket that's already attached. To lock out the
    sprocket I've seen where someone welded the sprocket to the axle without
    changing anything else on the wheel.

    Also, have you seen my prototype home designed giraffe? Maybe you could
    make something similar just with a smaller wheel?

    As for the gear ratio, for example: on a 10" wheel you would want twice
    as big a cog on the cranks then on the wheel so the giraffe would pedal
    and balance like a 20" giraffe.

    Unless you have access to welding equipment, I would recommend just
    using a back half of a regular bike frame; it looks kind of odd, but
    works quite well from what I have seen.

    Keep us posted on your progress!

    ~Cameron

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  3. loosejello
    Archived post
    #3

    I would use a wheelbarrow wheel or a handcart wheel.

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  4. al_lieffring
    Archived post
    #4

    I have a photo album at my Yahoo club with photos of a mini giraffe I
    built with a 12" bike wheel.

    The ratio seems to work the best will have an equivilant to a 20"
    tire.

    Tire diam/#of cog teeth x #of drive sprocket teeth = 20

    without going outside and counting I think the cog is 16 teeth and the
    cahin wheel is 24 theeth. I'll let someone else do the arithmatic, but
    it is in the 19 3/4" range.

    you will also want longer cranks with a giraffe than with the same wheel
    equivilant on a standard uni. I like to use 5" or 51/2 one piece
    cranksets. on my giraffes.

    Al

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