How can I tell if I have a short or long cage campag RD?

barrybridges
barrybridges Posts: 420
edited April 2013 in Workshop
I've got campag centaur groupset on my bike, which I bought in 2010. The rear mech looks like this:

http://www.worldclasscycles.com/campagn ... carbon.htm

I need to find out whether I've got a short, medium or long-cage derailleur as I'm looking to replace the cassette with a lower-gearing, but have heard there is incompatability with short and medium cages with lower gears.

So, question is - how can I find out?

The site above suggests that short cage is 55m, but which bit am I measuring?

Comments

  • declan1
    declan1 Posts: 2,470
    Look at it? It's quite easy to tell. Try measuring from the centre of one jockey wheel to the other.

    Road - Dolan Preffisio
    MTB - On-One Inbred

    I have no idea what's going on here.
  • keef66
    keef66 Posts: 13,123
    As above; it's saying the 55mm is from one jockey wheel axle to the other. Or just see which picture your mech resembles.
  • barrybridges
    barrybridges Posts: 420
    Sorry to be a nobber, but I'm none the wiser and my brain hurts.

    I've taken a couple of photos of the rear mech here:

    http://tinypic.com/view.php?pic=29ol6l3&s=6

    http://tinypic.com/view.php?pic=2im2es6&s=6

    It *looks* to me like it's a medium cage mech (I don't think there is such a thing as a long-cage road campag?)

    http://www.campagnolo.com/repository/do ... TAUR09.pdf on page 4 is the image.
  • dennisn
    dennisn Posts: 10,601
    barrybridges wrote:
    I've got campag centaur groupset on my bike, which I bought in 2010. The rear mech looks like this:

    http://www.worldclasscycles.com/campagn ... carbon.htm

    I need to find out whether I've got a short, medium or long-cage derailleur as I'm looking to replace the cassette with a lower-gearing, but have heard there is incompatability with short and medium cages with lower gears.

    So, question is - how can I find out?

    The site above suggests that short cage is 55m, but which bit am I measuring?

    Center to center of "Upper to lower pulley-axle". Seems pretty clear to me.
  • Ben6899
    Ben6899 Posts: 9,686
    Short.
    Ben

    Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76
    Instagram: https://www.instagram.com/ben_h_ppcc/
    Flickr: https://www.flickr.com/photos/143173475@N05/
  • infopete
    infopete Posts: 878
    Ben6899 wrote:
    Short.

    +1 short

    And dirty
    Oh and please remember to click on my blog:

    http://americanbicyclegroup.wordpress.com

    The more clicks I get the higher it creeps up the google radar :)
  • g00se
    g00se Posts: 2,221
    Looks medium to me.
  • g00se
    g00se Posts: 2,221
    Changed my mind - it's short. Measure from the axle of one of the pulley wheels to the other.

    You would only need a long cage for a triple. You might get away with a short for a low geared system. I've got a 50/34 front and a 29/12 rear (Miche) and it still works fine with a 2010 short cage Centaur rear mech - though it is at it's complete limit.
  • mercia_man
    mercia_man Posts: 1,431
    You have a short cage rear mech. I've looked at your pix and compared it to my medium cage 10-speed Chorus.

    Although it's not officially recommended, many people find they can run a 13-29 cassette fine with a short cage 10-speed Campag mech.

Categories