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Rear Mech Issue!!

  • 03-04-2010 6:27pm
    #1
    velo.2010
    Registered Users, Registered Users 2 Posts: 3,010 ✭✭✭


    Hi
    While overhauling the rear derailleur today an old problem arose again. Basically the B screw on my RD is all the way in to stop the top jockey wheel crunching on the larger sprockets. I know this isnt right and that the B crew should be about halfway in.

    I've tried undoing the bolt that fixes the RD to the hanger(though not all the way off) and unscrewing the B screw fully then screwing back in. No joy.

    The only thing I can think of is that the B screw has slipped against the hanger while I have changed wheels. I have noticed on this bike that I have to move the jockey wheels out of the way more so to allow the wheel slot into the dropouts. Perhaps doing that has affected the B screw?

    I would appreciate any help as I dont want to purchase a new derailleur as this one is new since last June. The Rd is a 6600 Ultegra model on a 5 series Trek. Thanks.


Comments

  • #2
    redmaxi
    Registered Users, Registered Users 2 Posts: 297 ✭✭redmaxi


    Very hard to diagnose these things without seeing of course but the same thing happened to me once and I couldn't figure out why the top jockey wheel was almost up against the cassette. It cycled OK but wasn't right.
    Then I noticed the broken spring 'catch' on the deraileur which butts up against the stop on the frame. This allowed the deraileur to ride up to the cassette. You'd imagine this would be obvious but it wasn't. Chain not too short ???


  • #3
    velo.2010
    Registered Users, Registered Users 2 Posts: 3,010 ✭✭✭velo.2010


    Thanks for reply Redmaxi.

    I'll look to strip the derailleur and have a proper look altogether.


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