Adjusting Front and back derailleur How do I.

Discussion in 'Cycling Equipment' started by glore2002, Apr 24, 2005.

  1. glore2002

    glore2002 New Member

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    Hello my friends around the world. I write from Buenos Aires, Argentina. I am a 41 year old computing teacher who loves bicycles and uses his bike to commute.

    My bike is a Raleigh M20 (21 speeds). What I would like to know is how to adjust both (front and back) derailleurs to avoid the chain from touching the cage.

    What are the steps I should follow to install my front derailleur correctly?

    Thanks in advance.
    German.-
     
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  2. boudreaux

    boudreaux New Member

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    www.parktool.com repair section has derailer adjustment. there are some gear combination like big chainring,bigger cogs and small ring smaller cogs that shouldn't be used and derailer rub in them probably cannot be adjusted out anyway.Some front shifters have a trim function to help with derailer rub,but your probably don't. If the front shifts well,you probably shouldn't fiddle with it and avoid the combinations that result in rub....There is no further adjustment in back,assuming the hi and low limit screws are set correctly and it shifts well to and from the large and small cogs.
     
  3. daveornee

    daveornee New Member

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    http://sheldonbrown.com/derailer-adjustment.html
    http://www.parktool.com/repair_help/FAQrindx.shtml
    http://www.parktool.com/repair_help/howfix_frontderailleur.shtml
    You should avoid significant cross-chaining as those combinations are lease efficient, wear the most on your drive train components, and tend to have the most FD chain rub. Besides, those combiations usually have nearly the same final drive ratios covered in more effecient combinations. To see what I mean, take a look at Sheldon Brown's gear calculator and imput your specifics:
    http://sheldonbrown.com/gears/
     
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