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Rear Derailleur

  • 23-02-2010 10:51am
    #1
    bryaner
    Registered Users, Registered Users 2 Posts: 3,181 ✭✭✭


    Hi can I get advice on my rear derailleur it seems too far forward
    It works fine but on the other bikes in the house the derailluer is further back.

    Photo0073.jpg

    Cheers.


Comments

  • #2
    seamus
    Registered Users, Registered Users 2 Posts: 68,317 ✭✭✭✭seamus


    If you're on the big ring at the front, this seems normal.

    But you shouldn't be using this combination - avoid extreme combinations such as big at the back and big at the front (or small/small).


  • #3
    Morgan
    Registered Users, Registered Users 2 Posts: 2,481 ✭✭✭Morgan


    Assuming the chain is on the large chainring at the front in that picture, it looks just about right.

    As a general rule you should avoid running your chain at extreme angles (large/large or small/small combinations).


  • #4
    bryaner
    Registered Users, Registered Users 2 Posts: 3,181 ✭✭✭bryaner


    seamus wrote: »
    If you're on the big ring at the front, this seems normal.

    But you shouldn't be using this combination - avoid extreme combinations such as big at the back and big at the front (or small/small).

    It is on the big front ring cheers for that I didn't know this combination was wrong


  • #5
    bryaner
    Registered Users, Registered Users 2 Posts: 3,181 ✭✭✭bryaner


    Morgan wrote: »
    Assuming the chain is on the large chainring at the front in that picture, it looks just about right.

    As a general rule you should avoid running your chain at extreme angles (large/large or small/small combinations).

    Thanks


  • #6
    victorcarrera
    Registered Users, Registered Users 2 Posts: 1,059 ✭✭✭victorcarrera


    If the chain is on the front big ring that looks about right.
    A rough way to check for most derailer bikes is to select largest front with smallest rear or vice versa and the derailer arm should be approximately vertical.
    It's all to do with chain length. Shimano recommend the correct chain length for that derailer as per this document.
    http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Alivio-Acera/RearDriveSystem/SI_6KFRB/SI_6KFRB_En_v1_m56577569830612587.pdf

    Chain Length
    Add 2 links (with the chain on both the Largest sprocket Largest chainring


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  • #7
    bryaner
    Registered Users, Registered Users 2 Posts: 3,181 ✭✭✭bryaner


    victorcarrera wrote: »
    If the chain is on the front big ring that looks about right.
    A rough way to check for most derailer bikes is to select largest front with smallest rear or vice versa and the derailer arm should be approximately vertical.
    It's all to do with chain length. Shimano recommend the correct chain length for that derailer as per this document.
    http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Alivio-Acera/RearDriveSystem/SI_6KFRB/SI_6KFRB_En_v1_m56577569830612587.pdf

    Chain Length
    Add 2 links (with the chain on both the Largest sprocket Largest chainring

    Just checked and it's vertical when on the bottom cog so all seems to be well

    Cheers for the info


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