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  1. #1
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    Oval chain rings

    Anybody using oval chain rings on SS 29ers? What is your opinion of them?

  2. #2
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    Reputation: meltingfeather's Avatar
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    How would you use oval chain rings on an SS?
    Chain way loose half the time?
    Tensioner?
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

  3. #3
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    Doesn't the chain wrap around half of the chain ring?

  4. #4
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    I have heard of people using Rotor rings on a SS & liking them.

  5. #5
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    "Biopace"… Brings back some memory… First MTB with triple chainring, SIS shifter, yellow color...

  6. #6
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    I gave up on them in the late 80's.

  7. #7
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    remember Bio pace well and a few other attempts over the last 25 years. they always come back to round

    Quote Originally Posted by LewisQC View Post
    "Biopace"… Brings back some memory… First MTB with triple chainring, SIS shifter, yellow color...

  8. #8
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    I started off with Bio pace 20 some years ago. Round rings ever since. I have a friend who has won several national championships in the SS class. He is sold on rotor rings. Says he has them on all his SS. I don't know if he runs a tensioner though.

  9. #9
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    Oval chain rings

    Quote Originally Posted by Lampshade29 View Post
    Doesn't the chain wrap around half of the chain ring?
    Yeah, you're right. For some reason my first thought was that it would change, but I don't think it does.
    I'll shut up now.
    Carry on.
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

  10. #10
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    Quote Originally Posted by muzzanic View Post
    I have heard of people using Rotor rings on a SS & liking them.
    Yeah, a buddy of mine does that and swears by it.

  11. #11
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    I heard of one case where a rider used to using conventional round rings switched to an oval one (Biopace), and developed knee pains within 4-6 weeks. They were quite severe. Something along the lines of chondromalacia.

    He switched back to the round rings, and the pain diminished, and then disappeared. He never tried the Biopace again. I guess he didn't want to give the hypothesis that his pains were caused by the eccentric rings a good test, at least not with his knees.

    This is only one case, of course. I thought it was mentioning, though. I've never felt the need to try them out on one of my own bikes either, probably due to the one guy's story, and also due to the fact that I'm perfectly happy riding with round chainrings in the first place.

    I'd certainly be open to reconsidering if I hear enough anecdotal stuff in support of them. Who doesn't want to get more bang for their energy output-buck?
    Re-Cycled Person who rides a mountain bicycle.

  12. #12
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    I use one and love it! No issues with dropping chains either( no tensioner just an EBB).
    Take a look at the BETD Goldtec chainrings.

  13. #13
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    Quote Originally Posted by meltingfeather View Post
    Yeah, you're right. For some reason my first thought was that it would change, but I don't think it does.
    I'll shut up now.
    Carry on.
    It does change, but not enough to cause chain droppage.

  14. #14
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    The Q-Ring is clocked completely different compared to the Biopace. The oval on the Q-Ring is at roughly just past the 3 o'clock position. The largest part of the oval is like pushing 2-3 teeth more than what is actually there. On a 52T, it'll be like pushing a 55T. The flat part of the ring will be like pushing a 49T. The Biopace is the opposite...they put the "oval" part of the ring at the dead spot of the chain ring.

    I ride Q-Rings on my road bike and I've had no issues with them.

    Slowtwitch article:
    Rotor long term test - Slowtwitch.com
    Cervelo S2
    Specialized Carve Pro
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