Rear Deraileur floating

fastercyclist
fastercyclist Posts: 396
edited February 2010 in Workshop
At the title says. It does not hold its position so the chain is not kept taught.

"Position" as in floating forwards and backwards at any tug. The axis of rotation is the point where the rear deraileur is attached to the bike. (i.e. part you screw in with the big allen key)

Shimano Ultegra.

Replies appreciated. Need to get training in for a race fast. :shock:
The British Empire never died, it just moved to the Velodrome

Comments

  • Barrie_G
    Barrie_G Posts: 479
    Check that the "B" screw is coming up against the stop on the hanger.
  • fastercyclist
    fastercyclist Posts: 396
    Barrie_G wrote:
    Check that the "B" screw is coming up against the stop on the hanger.

    Heya, it isn't and it's not long enough to do. I'm starting to wonder if I'm putting it on at the wrong angle.

    I haven't got anything to take a picture of it with so I drew this with paint (sorry).

    http://img691.imageshack.us/img691/5575/deraileur.jpg

    The bit labelled A does not move as the chain moves (the tooths are not engaged). The chain is only moving around the bit below it. I hope this sheds some light on how I may of set this up wrong.

    Cheers.

    Just tried to move the bike about. Made some unholy noises which quickly put a stop to it.
    The British Empire never died, it just moved to the Velodrome
  • balthazar
    balthazar Posts: 1,565
    Do those circles in you drawing represent the two jockey wheels, and the oval – the sprockets? Could you have threaded the chain through the derailleur the wrong way (so it engages only with one jockey wheel)?

    Check that the chain follows this path:

    300px-Rear_Derailleur.JPG
  • alfablue
    alfablue Posts: 8,497
    Is it a new chain? Did you cut it down to size?
  • desweller
    desweller Posts: 5,175
    Can the mech pivot around the big screw if you move it by hand?
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  • fastercyclist
    fastercyclist Posts: 396
    Yeah it looks slightly different to your picture.

    It does/did DesWeller.

    I've left it with the bike shop as I wanted my gears indexed as well and don't want to mess it up any more. Having to practice on my mountain bike at the moment :D

    [heavy as bricks!]

    Cheers anyway guys :)

    I knew the game was up when I saw a picture suggesting you needed a special tool to align the deraileur.
    The British Empire never died, it just moved to the Velodrome

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