Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member mtalinm's Avatar
    Join Date
    Dec 2009
    Location
    Westwood MA (just south of Boston)
    My Bikes
    2009 Trek Soho
    Posts
    2,129
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    chain skips only on small cog

    I was having trouble shifting to the smallest rear cog (while on the large front chainring) b/c one of the jockey wheels would rub against the dropout.

    It would shift to the smallest cog if I were on the smaller front chainring, so the LBS suggested lengthening the chain to reduce tension. It worked, and I can now shift to the smallest rear cog.

    but I have a new problem. when I am on the smallest rear cog (and on the large front chain ring, i.e. in top gear), the chain skips. It does not skip on the other cogs.

    my guess is that this means the chain is too long? I added only one link, so unfortunately I guess this means I either live with the skipping chain or temporarily having to go to the smaller front chainring in order to shift to the smallest rear cog.

    bike is a Xootr Swift folder with Capreo hub and 9-speed cassette + 105 derailleur.

    thanks for any tips.
    Trek Domane 4.5 (commute/distance), Specialized Roubaix (climber), Xootr Swift (winter/travel), Trek Soho (around town)

  2. #2
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    35,703
    Mentioned
    15 Post(s)
    Tagged
    0 Thread(s)
    jeez Capreo is only a 9t .. Chain replacement is step 1.
    the wear of chain would really soon
    transfer wear onto the 4~5 teeth that pulls the hub around ..

  3. #3
    Senior Member mtalinm's Avatar
    Join Date
    Dec 2009
    Location
    Westwood MA (just south of Boston)
    My Bikes
    2009 Trek Soho
    Posts
    2,129
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sorry, I forgot to mention it is a brqnd new chain.
    Trek Domane 4.5 (commute/distance), Specialized Roubaix (climber), Xootr Swift (winter/travel), Trek Soho (around town)

  4. #4
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    35,703
    Mentioned
    15 Post(s)
    Tagged
    0 Thread(s)
    Have to be where the bike is to say anything else.. this forum is just text.

  5. #5
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    18,066
    Mentioned
    20 Post(s)
    Tagged
    1 Thread(s)
    If it isn't related to chain or sprocket wear, and I'm assuming it isn't, I suspect that the trim is a bit off. Chain length is not a factor since the lower loop tension is set by the RD cage spring, and doesn't make a difference.

    I suspect it's more of a trim issue - check lower limit screw - or possibly the hanger is a bit off plane. You might also use the "B" screw to optimize the pulley/sprocket distance.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  6. #6
    Senior Member Mauriceloridans's Avatar
    Join Date
    Mar 2007
    Location
    Shreveport
    My Bikes
    1983 Trek 520, early 80's Univega Gran Tourismo, '98 Santana Arriva
    Posts
    264
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Jockey pulley was hitting the dropout. Chain is lengthened. Still skips with new chain. There may still be interference with the dropout and pulley, not enough to keep it out of the gear, but enough to cause skipping. If more B screw tension doesn't help I'd try a spacer to get that dropout away from the gear.

Posting Permissions

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