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  1. #1
    Long haired freak. wethepeople's Avatar
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    Universal Joint on a tallbike?

    Is there any reason it couldnt be done?

    I'm going to pick up a cheap U-joint and use it instead of lining up the forks because the head tubes are two different angles. I cant imagine why it wouldnt work, but then I'm not exactly the smartest person when it comes to these things.

    Although I have already learned abit from building this.

    "the bus came by and I got on, that's when it all began...there was Cowboy Neal at the wheel of a bus to never-ever land."


  2. #2
    Radfahrer Rincewind8's Avatar
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    Just keep in mind, that a universal joint doesn't transmit rotation linear. Meaning the angle you turn one end is not the angle you get at the other end, except when it is straight. The larger the angle between the two axels the larger the discrpency. And at a certain angle it locks up.

    http://en.wikipedia.org/wiki/Universal_joint
    TH 1.81 (133kg*62)

  3. #3
    Senior Member
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    Quote Originally Posted by Rincewind8
    Just keep in mind, that a universal joint doesn't transmit rotation linear. Meaning the angle you turn one end is not the angle you get at the other end, except when it is straight. The larger the angle between the two axels the larger the discrpency. And at a certain angle it locks up.

    http://en.wikipedia.org/wiki/Universal_joint
    would a CV (constant velocity) joint prevent these problems? It sounds like an expensive option. but I have a couple axel shafts sitting in a Geo Metro I'm parting out.

  4. #4
    Radfahrer Rincewind8's Avatar
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    Quote Originally Posted by StokerPoker
    would a CV (constant velocity) joint prevent these problems? It sounds like an expensive option. but I have a couple axel shafts sitting in a Geo Metro I'm parting out.
    It would:
    http://en.wikipedia.org/wiki/Constant-velocity_joint

    But it's usually also a very heavy option. I would use the universal joint and keep the angle fairly low (<<45).
    TH 1.81 (133kg*62)

  5. #5
    Senior Member
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    A fairly cheep and small(think bicycle) universal joint is to use a universal socket.They would need to be welded in place.

  6. #6
    crushing all limitations
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    You might run into a problem if the unversal joint isn't machined to very precise tolerances. Universal joints are designed for constant rotation in one direction. If there's any "slop" between the pieces, it will be hard to keep the wheel perfectly straight, and steering will feel a bit wobbly.

  7. #7
    Dog is my co-pilot 2manybikes's Avatar
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    Quote Originally Posted by wethepeople
    Is there any reason it couldnt be done?

    I'm going to pick up a cheap U-joint and use it instead of lining up the forks because the head tubes are two different angles. I cant imagine why it wouldnt work, but then I'm not exactly the smartest person when it comes to these things.

    Although I have already learned abit from building this.

    A friend of mine did exactly what you are thinking about. It works fine, I have ridden the bike.
    [SIGPIC][/SIGPIC]

  8. #8
    Long haired freak. wethepeople's Avatar
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    Well, no reason for it anymore. I got it to work, and here is some pics of the progress even though you guys have all seen tallbikes .



    And here is something else a friend made a while back, and yes, it does work.

    "the bus came by and I got on, that's when it all began...there was Cowboy Neal at the wheel of a bus to never-ever land."


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