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help identify part

AAbrewAAbrew Posts: 9
edited March 2017 in Road general
could someone tell me what this part is? the little plastic collar on the seat tube just above the bottom bracket. Scott CR1 bike. hopefully the links work
https://drive.google.com/file/d/0B88T58 ... sp=sharing
https://gzmyu4ma9b-flywheel.netdna-ssl. ... e09-01.jpg

Posts

  • crescentcrescent Posts: 1,087
    It's a chain catcher, sometimes called a 'dog fang' because of its shape. It is there to prevent a poorly adjusted front derailleur from shifting the chain off the small chainring and damaging the frame.
    Ribble Gran Fondo
    Bianchi Impulso
    BMC Teammachine

    “When I see an adult on a bicycle, I do not despair for the future of the human race. “ ~H.G. Wells
    Edit - "Unless it's a BMX"
  • ayjayceeayjaycee Posts: 1,333
    crescent wrote:
    It's a chain catcher, sometimes called a 'dog fang' because of its shape. It is there to prevent a poorly adjusted front derailleur from shifting the chain off the small chainring and damaging the frame.
    I can confirm that it's a chain catcher but would disagree that it's only necessary for a poorly adjusted front derailleur. The chain can jump off a properly adjusted one as well - unusual but it does happen!
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  • crescentcrescent Posts: 1,087
    ayjaycee wrote:
    The chain can jump off a properly adjusted one as well - unusual but it does happen!

    Fair point.
    Ribble Gran Fondo
    Bianchi Impulso
    BMC Teammachine

    “When I see an adult on a bicycle, I do not despair for the future of the human race. “ ~H.G. Wells
    Edit - "Unless it's a BMX"
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