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  1. #1
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    Can I use a Shimano Biopace (Eliptical chain ring) on a single speed/fixie?

    The title says it all. I have an old Shimano crankset with Biopace chainrings. I plan to
    use the 42T ring, but it is elipitcal. I am not putting any tensioner or what not, just
    a crankset and a cog. I doubt it will work. am I right or wrong?

  2. #2
    Senior Member iamtim's Avatar
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    You are wrong. It will work.

  3. #3
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    really? how come? The chain wouldn't get some slack in some positions?

    Quote Originally Posted by iamtim View Post
    You are wrong. It will work.

  4. #4
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    sheldon did it.

    for the affordability of a new ring, I'd just get a new one.....

  5. #5
    Senior Member cjump's Avatar
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    from sheldon:

    People are often astonished to learn that I ride Biopace chainrings on fixed-gear bikes. They imagine that there will be tremendous changes in chain tension as the chainring rotates. In practice, this is not the case. A 42 tooth chainring will generally engage 21 teeth against 21 chain rollers, regardless of its shape.
    There is a slight variation in tension resulting from the varying angle between the two straight runs of chain as the axis of the chainring rotates, but this has not generally been of a sufficient magnitude to cause any problem in practice for me.

  6. #6
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    I ran a biopace on my conversion for about a year (~1000 mi or so). I didn't have the straightest chainline (road cranks) and I only threw the chain once going downhill on an already slack-ish chain. If it's setup properly, it should be fine.
    Chris

  7. #7
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    Since I'm getting rid of the big ring, where can I get the chainbolts with the correct stack height?
    Can I use some home-depot washers?

  8. #8
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    your lbs or benscycle.net

    IMO, don't skimp on the bolts.. the cheap alloy bolts tend to snap.

  9. #9
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    those single speed bolts will work with my crankarm and chainring?
    Last edited by skinnyboy; 07-24-08 at 07:33 PM.

  10. #10
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    1 ring+crank=single speed bolts, yes.
    $12 for steel suginos at bens.

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