Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8

Thread: Chain lifespan?

  1. #1
    Senior Member
    Join Date
    May 2010
    Location
    Earth.. Buford Ga.
    My Bikes
    Trek 7.2.. Specialized Allez.. Fuji Nevada-29 1.4
    Posts
    78
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Chain lifespan?

    I ride a 2ish year old Allez with 500>1000miles and recently my chain/rear gearset has been chattering occasionally and seeking gears now and again, I had tried adjusting it a couple of times to no avail.. Just broke the chain.. it had been seeking badly and jumped then popped..

    I assume that repairing it is only a 'get you home' fix and replace it before riding it

  2. #2
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,126
    Mentioned
    45 Post(s)
    Tagged
    0 Thread(s)
    Wear happens .. lack of lubrication and grit left on the chain hastens wear,
    worn chain wears the chainwheels it passes over,
    So the whole set may need replacing ..

  3. #3
    bike whisperer Kimmo's Avatar
    Join Date
    Dec 2009
    Location
    Melbourne, Oz
    My Bikes
    copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
    Posts
    6,842
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    With only 1000km or so on it, I wouldn't expect a hell of a lot of wear unless it was mostly in bad weather.

    And 'chattering' sounds more like indexing gone out of adjustment. Worn chains make a throbby whirr. Measure 24 links and see how close you get to 12"/254mm. If it's less than 1% worn it's still okay.

  4. #4
    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
    22,401
    Mentioned
    66 Post(s)
    Tagged
    1 Thread(s)
    Chains break for reasons completely unrelated to how they wear. Wear occurs as the pins move in the journals when the chain winds onto and off sprockets. This allows the links to move slightly farther apart changing the pitch by a few thousandths of an inch, and causing the effect called stretch.

    Breakage usually occurs from sloppy or aggressive shifting, usually under load, which puts twisting and bending stress on the chain. Eventually some plates get spread to or beyond the ends of the pins, so that when the chain is next under tension a plate falls clear, and the chain snaps. Note that, depending on conditions, lots of time can elapse between what sets up the failure and the actual breakage.

    In your case, odds are that your RD went out of trim, possibly from a hanger bending, possibly just a cable adjustment. That caused the auto shifting, which included some under load and eventually the chain breakage.

    Replace the chain, and lesson for the future, when the RD starts acting up deal with it before it causes more damage.
    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.

  5. #5
    bike whisperer Kimmo's Avatar
    Join Date
    Dec 2009
    Location
    Melbourne, Oz
    My Bikes
    copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
    Posts
    6,842
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    And if your chain hasn't had a chance to wear much, your cassette should still be good to go.

  6. #6
    feros ferio John E's Avatar
    Join Date
    Jul 2000
    Location
    www.ci.encinitas.ca.us
    My Bikes
    1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
    Posts
    15,254
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Sheldon Brown recommended replacing a chain with only 1/2% elongation, rather than 1%. Another potential culprit is a worn jockey wheel in the rear derailleur.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

  7. #7
    bike whisperer Kimmo's Avatar
    Join Date
    Dec 2009
    Location
    Melbourne, Oz
    My Bikes
    copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
    Posts
    6,842
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    I'd be a putz not to defer to Sheldon.

  8. #8
    Pro Paper Plane Pilot wunderkind's Avatar
    Join Date
    May 2009
    Posts
    1,624
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Chains are so cheap. Just replace them every 2 yrs or 2000km. YMMV of course.
    Vancouver Modern Portrait Photography

    Zenfolio.com membership discount code: UBV-HJY-SCY

Posting Permissions

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