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Rear derailleur - fine tuning

  • 28-06-2011 10:12AM
    #1
    slimjim1987
    Closed Accounts Posts: 13 ✭


    Hi Guys,

    I have a problem shifting gears on my bike. As of yesterday, when i shift up or down on the rear wheel, the gear change is rough, clunky and noisey. As i said it was fine yesterday, perhaps something has become loose? The bike just had a six week service last week. I have 105's on the back.

    Cheers


Comments

  • #2
    Beasty
    Administrators, Social & Fun Moderators, Sports Moderators Posts: 78,464 Admin ✭✭✭✭✭Beasty


    Probably just a bit of cable stretch - there's a little knob where the cable enters the real derailleur that you twist to fine tune the gearing - a little experimenting with this should sort you out


  • #3
    slimjim1987
    Closed Accounts Posts: 13 ✭slimjim1987


    Yes i remember fiddling with this yesterday, does it have to be tight or loose? Or just play around with it until the gears shift correctly?


  • #4
    Beasty
    Administrators, Social & Fun Moderators, Sports Moderators Posts: 78,464 Admin ✭✭✭✭✭Beasty


    If the cable has stretched you need to tighten it slightly, but if you've been playing around with it you may already have (over)done that


  • #5
    blorg
    Registered Users, Registered Users 2 Posts: 15,995 ✭✭✭✭blorg


    Tightening it makes the cable longer, loosening it makes the cable shorter. Generally, you need to loosen it.

    Edit: by 'loosen', I mean, unscrew the adjuster counter clockwise. This tightens the cable and pulls your rear derailleur left, towards the wheel to a bigger sprocket.


  • #6
    bcmf
    Closed Accounts Posts: 6,679 ✭✭✭bcmf


    Find the gear that it is roughest/noisiest in. Where the cable goes into the rear mech there will be a barrel adjuster. Turn it anti-clockwise 1/4 of a turn at a time until it gets smooth again. May take a couple of turns to get it sorted.
    As Beasty say's more then likely cable stretch.


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  • #7
    slimjim1987
    Closed Accounts Posts: 13 ✭slimjim1987


    Cheers lads


  • #8
    Beasty
    Administrators, Social & Fun Moderators, Sports Moderators Posts: 78,464 Admin ✭✭✭✭✭Beasty


    blorg wrote: »
    Tightening it makes the cable longer, loosening it makes the cable shorter. Generally, you need to loosen it.
    I meant tighten the cable as you need to take up the slack caused by the stretching, which means, as stated by bcmf, turning the barrel anti-clockwise

    (the cable itself doesn't get any longer or shorter;))


  • #9
    bcmf
    Closed Accounts Posts: 6,679 ✭✭✭bcmf


    if you have been playing around with it this is the way to solve it.

    Try and shift into the smallest sprocket. If it doesnt then your cable is too tight. Wind the adjuster clockwise until the chain drops. ( I then just give the adjuster another fifth of a turn for good measure)
    If it drops into smaller sprockets but hesitates going the opposite way up to the bigger sprockets the then cable is too loose.Turn the adjuster anti clockwise until its noiseless and you get a clean crisp shift.
    Rear shifting is mostly all about cable tension.


  • #10
    bcmf
    Closed Accounts Posts: 6,679 ✭✭✭bcmf


    https://www.youtube.com/watch?v=SkzvfCaIbyQ


  • #11
    SSCorn
    Registered Users, Registered Users 2 Posts: 22 ✭SSCorn


    The shifting on my rear derailleur is OK but the cassette/chain/derailleur is slightly noisy as I cycle. Its worse for some gears than others, e.g. 1,2 are OK, then it gets noisy in 3rd, then better down into 4th and 5th.

    I've Google around this but couldn't find anything. Any ideas?


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  • #12
    Beasty
    Administrators, Social & Fun Moderators, Sports Moderators Posts: 78,464 Admin ✭✭✭✭✭Beasty


    As we had a thread on this a couple of days ago, I've merged them

    Beasty


  • #13
    bcmf
    Closed Accounts Posts: 6,679 ✭✭✭bcmf


    would it be that the chain is rubbing of the front derailleur as you move thru gears at the back. Chainging the gears at the back alters the chainline ie the angle the chain is at between the front mech and gears at the back.
    As you change gears at the back you will need to alter the the front to compensate for the change of angle on the chain.


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