Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Member
    Join Date
    Oct 2011
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    44 or 46 Tooth Chainring?

    Hi,

    My wife and I are both high-cadence riders by nature so we prefer small gaps between gears. Current front chainrings are 50, 39, 26. Unless we are going 20 mph or over we are in the 39.

    I'm thinking I would like to lower the gearing to a 46 (or 44), 34, 26. I'm hopingthis would let us use the large chainring more often and provide more us with more useful gears in a range where we can use them. My question is this: I have read that Shimano (we have a Tiagra triple) is made for a 12 tooth gap between chainrings. I'd really like to order a 44, but I'm afraid it won't shift as well because of the 10 tooth difference. Going with a smaller gap between chainrings doesn't seem like a problem to me. (I can see how a larger gap could be a problem for upshifts).

    The other problem is I'm not sure if the Tiagra would work well with a 46 in which case I may need a Mtb. derailleur of some sort? (Deore?)

    Any advice would be much appreciated,

    Thanks,

    Jack

  2. #2
    Senior Member rdtompki's Avatar
    Join Date
    Nov 2008
    Location
    Hollister, CA
    My Bikes
    Volagi, daVinci Joint Venture
    Posts
    3,934
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How high is high cadence? A 44-11 at 110 rpm only gives you about 34mph. I don't know where you live, but unless it's dead flat there will probably be many times when you would spin out that gear. If you were running a a 12-27 cassette with your current chainrings you could stay in the middle of the cassette where the jumps are quite small.
    Rick T
    --------
    Volagi - Triple"ized" and Tubeless
    daVinci Joint Venture

  3. #3
    pan y agua merlinextraligh's Avatar
    Join Date
    Aug 2005
    Location
    Jacksonville
    My Bikes
    Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er
    Posts
    27,222
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    question is the BCD of the 2 outer rings. (bolt circle diameter) It may well be that the 2 outer rings are 130mm, in which case 38 teeth is as low as it goes.
    You could fall off a cliff and die.
    You could get lost and die.
    You could hit a tree and die.
    OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.

  4. #4
    Member
    Join Date
    Oct 2011
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Merlin, the Bolt Circle Diameter is 110 and I've found some Vuelta rings online that should work, so I think we're good there.

    RD, you make a good point about 34 mph being top end. I'd say we generally ride 95 to 105. My wife has had to switch to 130mm cranks due to a knee problem, so that's another reason I'm thinking I want lower gears. I think in most cases I'm good with coasting if we're going over 32 or so, but it's hard to say never having had that gear as a limiter. I think I generally shut it down when we hit 35 or so most of the time anyway. We also have an 8 speed, so the jumps between teeth aren't as close between as they could be. Your post does make me think I want to go with the 46 though.

  5. #5
    Junior Member ChrisB5string's Avatar
    Join Date
    Sep 2011
    Posts
    5
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Bornco,

    Having just gone thru this ordeal, I would stay with the 12 tooth difference (46 -34 rings) . I was ready to ready to make a change sort of like you are thinking of ( 54 to 53) but Peter White talked me out out of it... smart man

Posting Permissions

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