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crazy swing arm

This is a discussion on crazy swing arm within the General forums, part of the Caferacer.net Forums category; Whats up with the swing arm on this bike pretty crazy set up....

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Thread: crazy swing arm

  1. #1
    Senior Member grinch77's Avatar
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    crazy swing arm

    Whats up with the swing arm on this bike pretty crazy set up.

  2. #2
    Senior Member kenessex's Avatar
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    fubar. check some 70's kawasakis. kr750?


    Ken
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    Senior Member freedomgli's Avatar
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  5. #4
    Senior Member freedomgli's Avatar
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    The bike was built by the Burning Blood Racing Team to compete in the All Japan Road Race Championship GP250 class.

  6. #5
    Senior Member freedomgli's Avatar
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    The parallelogram rear suspension is nothing new


  7. #6
    Moderator jbranson's Avatar
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    I say it's a crime against nature and disturbs my world view. Please remove it.

    JohnnyB

  8. #7
    Senior Member crazypj's Avatar
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    It was used on a lot of bikes in early 70's.
    You keep constant chain tension if links are correct length, or, you can set up for rise, squat and anything in between.
    It should work even better with modern dampers.
    Only real issue is extra weight and a lot of pivots to wear
    I dabble in rocket science, when I\'m not picking my nose
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  9. #8
    Senior Member grinch77's Avatar
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    thanks for the explanation pj.

  10. #9
    Senior Member jaguar's Avatar
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    kinda cool idea
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  11. #10
    Senior Member KeninIowa's Avatar
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    So you could set it up so there's negligable wheelbase change throughout wheel travel.

    Height of the frame attachment points has an effect on how the chassis "sees" power. Notice the modern one has longer arms on the birdgage. Off the top of my head I'd say higher the top frame attachment point is the less wheelie prone the bike.

    The modern bike, assuming the shock's mounted how I think it is, the shock isn't loaded by accel/decel forces. The old bike the shocks are actually more loaded by accel than they would be in a conventional setup.

    It's basically a four-bar no different than a dirt late model or a pro stock drag car. Only thing limits what you can do on a bike is that any change that makes traction under power causes it to unload on decel. i.e. can't get near as radical as you can w/a car.




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