elliptical rings- Mtbr.com
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  1. #1
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    elliptical rings

    Anyone ever or heard of anyone try using the elliptical rings (ala Rotor Q) on a single speed?

  2. #2
    one chain loop
    Reputation: fishcreek's Avatar
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    did a magic gear with biopace, no problemo.

    everything sucks but my vacuum cleaner.

  3. #3
    Master of the Obvious
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    Quote Originally Posted by fishcreek View Post
    did a magic gear with biopace, no problemo.


    Dude, I love that bike, complete and utter awesomeness!
    Check out my Blog!
    Yes ! I am posting on my Blog again! come visit!

  4. #4
    one chain loop
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    thanks! bike is long gone. it was a fun project.
    everything sucks but my vacuum cleaner.

  5. #5
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    I switched to a rotor ring on my SIR9 this year. Running 34/20 up from 32/20 with the round ring. I'm definitely faster on the flats and climbing hasn't been affected. I really don't notice much of a difference in my pedal strokes either. I'd have to try a 34/20 with a round ring to see how much of a difference it really makes but the bike just seems to truck along. I do notice a little more wheel spin on sketchy out of the saddle climbs.

  6. #6
    Oaktown Honkey on Strava
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    sweet thread.

    Can you get a biopace 34 to fit on XT 775 cranks with 104 BCD? hmmmmm. I have to try this. Two free teeth=faster?

  7. #7
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    I converted a biospace 3x crankset to SS. I put the middle ring on the outside of the crank. It works awesome. I do not feel the oval-ness of the ring when spinning normal RPMs but when slow spinning (like on a climb), I do feel it.

    I don't think there is any specific advantage to biopace (or other elliptical rings), but they look cool, I get a lot of comments, and I just wanted to see how well they work.

    Sheldon Brown used to run these on his bikes and he had a lot fo good things to say about them.

    I really like the look of the old biopace cranks. I polished them up and they look expensive! Shimano was really at the top of their game back then (still are I guess).

  8. #8
    Stokeless Asshat
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    Quote Originally Posted by hoolie View Post
    Can you get a biopace 34 to fit on XT 775 cranks with 104 BCD? hmmmmm. I have to try this. Two free teeth=faster?
    Biopace was 110-74 BCD. I have no knowledge of Rotor.
    Zip ties? Not on my bike!

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  9. #9
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    I have a Goldtec (UK) oval ring on my ss - rotor-ish orientation, 34/19 works well from a 32/19 before. I really like it, a definate subtle improvement to acceleration / flat trail speed with no perception of increased effort uphill imo. Recommended.

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