which size rear mech?

duncster999
duncster999 Posts: 16
edited April 2008 in Workshop
i had a 105 rear mech that was destroyed during mechanical failure.

i intend to upgrade to ultegra. ultegra have short and medium cage versions.

i'm running 34/50 front, 12/27 rear. i think the short will be OK especially as i don't use the smallest front and smallest rear at the same time.

your thoughts pls! :D

Comments

  • robbarker
    robbarker Posts: 1,367
    Short will work (I've tried it) but Mr Shimano says GS (med) cage. If you're buying new I'd go for the latter. Compatibility charts are on the Shimano website.
  • duncster999
    duncster999 Posts: 16
    cheers, Rob.

    when you say it will work, did you experience any issues?

    i'm keen to go for short as it will look better, but obviously want it to work!
  • robbarker
    robbarker Posts: 1,367
    No issues here but I was careful about not taking the p*ss with the chaniline. I wouldn't recommend it , and you'd be frankly mad to deliberately buy the incorrect one when you could just as easily get the correct fitting, but it will work if you need it to.
  • topdude
    topdude Posts: 1,557
    I have the same 34/50 and 12/27 setup as you with a short mech. I carefully shortened the chain so the mech cage could cope at both extremes. Obviously i never use big/big or small/small but if i did it would not be a problem except for the ridiculous chainline.
    If you want to play safe get the longer one, if you want short it works fine.
    He is not the messiah, he is a very naughty boy !!

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