Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Senior Member Steve90068's Avatar
    Join Date
    Sep 2008
    Location
    Bay Area, CA
    My Bikes
    09' BMC Streetfire
    Posts
    1,312
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Chain keeps coming off when descending. What am I doing wrong?

    Hi Guys,

    I'm relatively new to mountain biking so I apologize for the newbie question.

    When descending, I have my chain in the big ring and small cog combo. If I'm going fast and hit some rough parts of the trail, my chain flys off from the big ring to the outside of the crank.

    Should I be using a different gear? This didnt seem like a problem until the last week.

    Any help is greatly appreciated.

    Thanks!
    2010 Lynskey Cooper - Force/Red
    2011 Santa Cruz Superlight - XT DynaSys

  2. #2
    Senior Member Steve90068's Avatar
    Join Date
    Sep 2008
    Location
    Bay Area, CA
    My Bikes
    09' BMC Streetfire
    Posts
    1,312
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The bike is a single pivot 2011 Santa Cruz superlight.
    2010 Lynskey Cooper - Force/Red
    2011 Santa Cruz Superlight - XT DynaSys

  3. #3
    Junior Member
    Join Date
    Jul 2011
    Location
    Albania
    My Bikes
    Rog, Root, Corratec, Cannondale
    Posts
    7
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Move the chain to the biggest cog. That should solve the problem.

    If not, than your chain might be too loose.

  4. #4
    Senior Member pablosnazzy's Avatar
    Join Date
    Jul 2010
    Location
    fruita, co
    My Bikes
    rocky mountain SLAYER!!!! trek, voodoo, surly, spot, bianchi, ibis
    Posts
    1,702
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    it could be your derailleur limits are off and need to adjusted. also chain in big ring and small cog means lots of slack, you can pedal and cause the chain to come off.

  5. #5
    Single-serving poster electrik's Avatar
    Join Date
    Aug 2009
    Location
    Toronto, Canada
    Posts
    5,096
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Chain might be too long, also may be a single pivot issue... the wheel axle travels in an arc which leads to tensioning and slackening the chain. Chains do get dropped, but consistent dropping is usually a result of poor setup.

Posting Permissions

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