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Help! Upgraded from short to long cage mech !!

SportivemanSportiveman Posts: 157
edited October 2018 in Workshop
I have changed my rear mech from a short cage to long cage mech both ultegra 6800 I have spent hours currently a 11-28 Cassette It went only up to about 4 cog so I shortened the outer cable and with lots of fiddling it will go into top cog with lots of grinding even with the adjuster on mech wound out fully . I can’t work it out I haven’t tried using the h or low screws . I’m thinking chain ? I put the longer cable back on .
P.s reason for change I want to put on a 11-32 Cassette
Pic below
ziD4Gb3.jpg

Posts

  • thistle_thistle_ Posts: 6,896
    with lots of fiddling it will go into top cog with lots of grinding even with the adjuster on mech wound out fully
    Adjusted the B screw?
  • MatthewfalleMatthewfalle Posts: 17,380
    cable is trashed for a start.....

    why have you not adjusted the h & l screws?
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • with lots of fiddling it will go into top cog with lots of grinding even with the adjuster on mech wound out fully
    Adjusted the B screw?

    Yep wound it in about 90% made no difference?? So put it back where it was
  • cable is trashed for a start.....

    why have you not adjusted the h & l screws?

    Yep inner is Now knackered but used it for testing . I didn’t think the screws would need adjusting :oops:
  • So is that outer cable too long ? I will need to replace the inner , plus is it the low or high to adjust largest cog ? Wind in ?
  • Vino'sGhostVino'sGhost Posts: 4,129
    well here we go.

    The chain is in small small in that picture. There is quite a lot of tension in the Derailleur. The chain is too short to work properly and needs to be replaced. This is normal since it needs to travel a lot further.

    Replace the chain

    re index the RD

    Adjust limit screws (if necessary)
  • sungodsungod Posts: 15,247
    op, why don't you simply set it up the way shimano says to set it up?

    http://si.shimano.com/pdfs/dm/DM-RD0003-09-ENG.pdf
    my bike - faster than god's and twice as shiny
  • lesfirthlesfirth Posts: 1,356
    sungod wrote:
    op, why don't you simply set it up the way shimano says to set it up?

    http://si.shimano.com/pdfs/dm/DM-RD0003-09-ENG.pdf

    As above.

    Set it up step by step from the beginning.
  • MatthewfalleMatthewfalle Posts: 17,380
    cable is trashed for a start.....

    why have you not adjusted the h & l screws?

    Yep inner is Now knackered but used it for testing . I didn’t think the screws would need adjusting :oops:


    ciao!

    you'll need to pop a new inner in so its all smooth and works proper. you can't set anything up with a knackered cable.

    adjust l and h screws

    get all working THEN trim down cable

    any more probs pop back on here and we'll have a look.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • svettysvetty Posts: 1,904
    Why would you think that the limit screws on a new derailleur would magically be spot on for your particular bike?

    Without settling these correctly no amount of fiddling with the cable tension will correct the shifting.

    RTFM!
    FFS! Harden up and grow a pair :D
  • Vino'sGhostVino'sGhost Posts: 4,129
    HAHAHHA
  • edward.sedward.s Posts: 209
    Make sure you have clicked the shifter all the way into the 'small cog' position.
  • MatthewfalleMatthewfalle Posts: 17,380
    ciao

    you all ok with how the limit screws work?

    ciao
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • craigus89craigus89 Posts: 887
    Surely you would google something like this before attempting it? It baffles me that people would try and install a new mech without a cursory glance online to see if there was anything you needed to do that you weren't aware of.
  • Soz forgot to say it’s a second hand not new mech . Normally others I used didn’t need the adjuster screws tweaking !
  • Vino'sGhostVino'sGhost Posts: 4,129
    ATT : OP :)

    Please remove the cable, reinstall and start from scratch following the dealer manual instructions.

    You tube and Park tool do a very clear instruction video on how to complete this basic task which is easier to understand than the manual. https://www.youtube.com/watch?v=UkZxPIZ1ngY

    you may find you need a new chain or possibly add a couple of links if A you have them and B the chain is newish.

    failing that, if youre a member of a club ask someone, its the sort of task that most people can do perfectly well.

    If all that fails its the LBS and all the cost that that entails for you.
  • vrsmattvrsmatt Posts: 156
    I'm not sure why OP thinks SC to LC is an upgrade when keeping the same Chainrings/Cassette either?
    Giant TCR Composite 1, Giant Defy Advanced 2, Boardman Comp, Santa Cruz Heckler, Raleigh M-Trax Ti, Strida LT, Giant Halfway
  • cooldadcooldad Posts: 32,599
    VRSMatt wrote:
    I'm not sure why OP thinks SC to LC is an upgrade when keeping the same Chainrings/Cassette either?


    Errrrrr
    ...
    P.s reason for change I want to put on a 11-32 Cassette
    ...
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

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  • pinnopinno Posts: 47,772
    seanoconn - gruagach craic!
  • cooldadcooldad Posts: 32,599
    Should be required reading.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
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