Hydraulics

Discussion in 'Cycling Equipment' started by Sam Ford, Mar 18, 2003.

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  1. Sam Ford

    Sam Ford Guest

    Has anyone ever tried to use hydraulic systems instead of chain drives on bikes? I would have
    supposed that such an option would be advantageous on recumbents with their huge lengths of chain. I
    am not thinking of hydraulic motors, which would probably be impossibly heavy and expensive, but
    just a couple of cylinders driven by the pedals transferring through tubes to a couple of cylinders
    cranking the rear wheel. At first sight it sounds very attractive and should be mechanically
    efficient which could not be the case with any sort of shaft drive.
     
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  2. Ted Bennett

    Ted Bennett Guest

    "Sam Ford" <[email protected]> wrote:

    > Has anyone ever tried to use hydraulic systems instead of chain drives on bikes? I would have
    > supposed that such an option would be advantageous on recumbents with their huge lengths of chain.
    > I am not thinking of hydraulic motors, which would probably be impossibly heavy and expensive, but
    > just a couple of cylinders driven by the pedals transferring through tubes to a couple of
    > cylinders cranking the rear wheel. At first sight it sounds very attractive and should be
    > mechanically efficient which could not be the case with any sort of shaft drive.

    Sam, you are a dreamer. "Not that there's anything wrong with that. . "

    Yes, a system such as you suggest is certainly possible to build. Now run along and do some research
    on the cost, weight, and efficiency of those hydraulic cylinders. For extra credit, compare and
    contrast your results with a typical bicycle drive train, which weighs a couple of pounds, costs
    under $100, and is over 90% efficient, even when it's so dry it squeaks.

    --
    Ted Bennett Portland OR
     
  3. Sam Ford

    Sam Ford Guest

    Another fine mess I've got myself in!!

    Thanks, Ted, I did half think it might fall down in the weight stakes, but must admit I hadn't
    thought it would be all that much less effecient than chain drive.

    "Ted Bennett" <[email protected]> wrote in message
    news:[email protected]...
    > "Sam Ford" <[email protected]> wrote:
    >
    > > Has anyone ever tried to use hydraulic systems instead of chain drives
    on
    > > bikes?

    > Sam, you are a dreamer. "Not that there's anything wrong with that. . "
    >
    > Yes, a system such as you suggest is certainly possible to build. Now run along and do some
    > research on the cost, weight, and efficiency of those hydraulic cylinders. For extra credit,
    > compare and contrast your results with a typical bicycle drive train, which weighs a couple of
    > pounds, costs under $100, and is over 90% efficient, even when it's so dry it squeaks.
    >
    > --
    > Ted Bennett Portland OR
     
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