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Rear derailleur adjustment tip needed

  • 31-03-2015 3:07pm
    #1
    oceanclub
    Registered Users Posts: 3,411 ✭✭✭


    I bought my bike into a new place for a full service a few months and what a mistake that was. It's never really been the same since.

    One problem is that the rear derailleur is never quite right; I've adjusted the barrel back and forth and there are always two cogs which required _two_ changes of gear, not one, before the chain slips. Adjusting the barrel seems to merely move the position of this issue up or down the cogs.

    The service involved changing the rear cogset - I'm not sure did this cause the issue. The number of cogwheels match the number of gears, could there be another issue?

    Just wanted to ask before I bring the bike somewhere else for a service.

    P.


Comments

  • #2
    torydiver
    Registered Users, Registered Users 2 Posts: 198 ✭✭torydiver


    Loads on YouTube about setting up / indexing gears......


  • #3
    joxerjohn
    Registered Users, Registered Users 2 Posts: 396 ✭✭joxerjohn


    It is best to change the cassette and the chain at the same time. Do you know if chain was changed as well as the cassette ?

    Problems with shifting as you describe can arise if both are not changed together.

    I would bring the bike back to the shop and get let them sort it out.


  • #4
    Type 17
    Registered Users, Registered Users 2 Posts: 2,731 ✭✭✭Type 17


    Something to watch out for is that the (eg 8) clicks of the shifter may not be aligned with the (eg 8) sprockets of your cassette - most shifters have a "spare" click beyond first (biggest sprocket), and if the mechanic has goofed up, he might have set it up this way.
    If the clicks/sprockets are misaligned like this, you will have the exact issue that you describe, with some (but not all) sprockets' shifts not being smooth.
    Check for it by shifting out to the smallest sprocket, and then seeing if the shifter will click one more time (only making the cable slack).
    If it's wrong, you can re-tension the cable as per one of the good set-up videos on YouTube.


  • #5
    cython
    Registered Users, Registered Users 2 Posts: 4,774 ✭✭✭cython


    joxerjohn wrote: »
    It is best to change the cassette and the chain at the same time. Do you know if chain was changed as well as the cassette ?

    Problems with shifting as you describe can arise if both are not changed together.

    I would bring the bike back to the shop and get let them sort it out.

    I would say it's required to change the chain if the cassette has been changed, but not necessarily required to change the cassette for the chain being changed - in the latter scenario it depends on how far gone the chain, and consequently the cassette, might have been. But in the OP's case since they know the block was changed, the chain definitely should have been too.


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