Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Senior Member
    Join Date
    Apr 2012
    Location
    Orange Park, FL
    My Bikes
    2004 Co-Motion Speedster
    Posts
    134
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Alternate timing rings?

    After viewing the link on the White Industries new 11-sp hub from Interbike, I looked at a couple entries from the show. While I've heard of oval chain rings before, is this something that would work as timing chain rings: OVAL 104BCD chainring ? (While our Speedster IS green & white, I'm only viewing this from a functional standpoint.)
    Jeff

    Learn from other people's mistakes. You won't live long enough to make them all yourself.

    2004 Co-Motion Speedster
    2010 (Specialized) Carmel comfort (my neighborhood bike)
    2008 Raleigh comfort (wife's neighborhood bike)

  2. #2
    Senior Member
    Join Date
    Nov 2008
    Location
    Bay Area, Calif.
    Posts
    4,979
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    I don't see any reason why using a matched set in the same orientation wouldn't work, but what are you trying to accomplish? Functionally they'd be the same as a matched set of round rings. I.e. you don't get the supposed advantage of oval rings in getting you through the 'dead' zone quicker since the matched timing rings just transfer whatever motion the captain puts into his crank to the stoker's.

  3. #3
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    2,446
    Mentioned
    41 Post(s)
    Tagged
    0 Thread(s)
    How about those for a Gates Belt? timing chain to belt conversions are pretty common these days..


    you could fit the oval ones to the final drive, where the chain-tensioner in the RD
    makes up for any differences the radial distance changes may cause ..

    http://www.rotorbikeusa.com/
    Last edited by fietsbob; 09-23-14 at 02:35 PM.

  4. #4
    WillFam-Clovis,CA
    Join Date
    Jan 2009
    Location
    Clovis, CA
    My Bikes
    Triplet, Gitane Tndm, Trek 660 & Trek MTB
    Posts
    138
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    ...where the chain-tensioner in the RD
    makes up for any differences...
    absoluteBLACK website states that you can use the oval chainring with a fixie, so there would be no difference to take up in the RD. They are designed to have every half circle in the rotation taking up the same amount of physical chain.

    I still wonder about all the hype with oval chainrings in the past, and research that has shown that there is little to no benefit to them. I think that I saw at least one rider in the 2013 TDF that sure looked like they had an oval ring! "If" there is benefit, then the drive side should be sufficient.

    WillFam

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •