Results 1 to 7 of 7
  1. #1
    mtbr member
    Reputation:
    Join Date
    Mar 2018
    Posts
    11

    What caused my chain to pop off the chainring

    I ride a 2x hardtail (less than a year-old Trek Procaliber 6 with about 700 miles on it). The chain came off the large chainring during a brief steep climb while I was standing and cranking hard. I heard a clunk sound, then the chain popped off on the pedal side and I went down hard. My helmet saved me from a bad head injury, and knee pads I was wearing on a road ride prevented knee damage. My shoulder took a hit, but not real bad.
    So I'm taking my bike to the local shop where I bought it. I'm thinking the chain might be stretched or the chainring teeth might be chewed up or maybe the rear derailleur wasn't adjusted properly and allowed too much chain slack. Does any of this sound plausible and is there anything else that should be checked? I don't want this to happen again.
    And yes, I'm buying a new helmet since the impact cracked a section of my Giro.

  2. #2
    mtbr member
    Reputation:
    Join Date
    Sep 2014
    Posts
    50
    Sorry about your crash. Glad to hear you're basically OK. Many things can contribute to a chain falling off. Start with the high limit adjustment on the front derailleur. Your chain could be worn (chain stretch), but that doesn't usually make a chain come off. At 700 miles though, it's entirely possible that your chain is ready for replacement. Climbing hard using the big chainring can do it just because of flex in the crankset and frame. Climbing in the smaller chainring would fix that. Rear derailleur shouldn't be a cause since your chain is tight coming on to the chainring no matter what it's doing while climbing. Lot of things to look at, and your lbs should be able to take care of it. Worth learning the basics of maintenance as part of this so you can avoid some of these things in the future and do preventative work before it costs you too much.

  3. #3
    Uly
    Uly is offline
    mtbr member
    Reputation:
    Join Date
    Aug 2009
    Posts
    344
    Worn chain ring could do it

  4. #4
    Barely in control
    Reputation: Schulze's Avatar
    Join Date
    Feb 2007
    Posts
    1,497
    Are we supposed to ask you 20 questions on what components you have or google it for ourselves or something?

  5. #5
    mtbr member
    Reputation:
    Join Date
    Mar 2015
    Posts
    448
    Sometimes chains come off....

  6. #6
    mtbr member
    Reputation:
    Join Date
    May 2018
    Posts
    1
    Get a narrow wide chain ring def the most important investment you make besides tires


    Sent from my iPhone using Tapatalk

  7. #7
    mtbr member
    Reputation:
    Join Date
    Mar 2018
    Posts
    11
    My chain was worn out. I had over 700 miles on it. Replaced with a Shimano.

Similar Threads

  1. Music Thread: alt. pop/rock, post punk, alt. indie rock, synth pop
    By Boris Badenov in forum Off Camber (off topic)
    Replies: 105
    Last Post: 11-16-2017, 08:11 PM
  2. Pop Pop, Pop Music
    By Ridnparadise in forum Off Camber (off topic)
    Replies: 11
    Last Post: 05-14-2015, 08:55 AM
  3. RockShox Reba RL 29er, To Pop Or Not To Pop.
    By u05re0 in forum Shocks and Suspension
    Replies: 2
    Last Post: 12-17-2012, 12:54 PM
  4. Chain jumping gears..caused by smaller chainring?
    By Crash Dummy in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 4
    Last Post: 04-19-2012, 11:32 AM
  5. Elcheapo pop to no pop
    By 1niceride in forum Shocks and Suspension
    Replies: 1
    Last Post: 08-18-2006, 04:57 PM

Members who have read this thread: 40

Posting Permissions

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

THE SITE

ABOUT MTBR

VISIT US AT

mtbr.com and the ConsumerReview Network are business units of Invenda Corporation

(C) Copyright 1996-2018. All Rights Reserved.