Shimano Deore Front Derailleur

Chipsticks
Chipsticks Posts: 27
edited February 2011 in MTB buying advice
I have a Kona Lava Dome 2006, which badly needs a new Front Mech due to years of abuse interrupted with only occasional TLC.

Looking at the Front Mechs on Chain Reaction I noticed that I need to be careful when ordering as there are different sizes quoted ("28.6mm" and "34.9mm" are quoted).

I take it these sizes are referring to the circumference of the frame tube to which the front mech will be attached? I equally take it that an old school steel hardtail with skinny cromoly tubes will be likely to be compatible with the 28.6mm mech?

Can anyone advise? Thanks in advance.

Comments

  • Chunkers1980
    Chunkers1980 Posts: 8,035
    Yep. You need to measure the tube and check.

    One size mech does fit various sizes using the spacer included - but there may be two varients - tech docs are your friend.
  • jayson
    jayson Posts: 4,606
    The 34.9mm bracket will come with shims to make it fit the smaller 28.6mm seat tube if needed so if in doubt buy the bigger one.
    Remedy

    Merida

    Austria 2012
  • cooldad
    cooldad Posts: 32,599
    jayson wrote:
    The 34.9mm bracket will come with shims to make it fit the smaller 28.6mm seat tube if needed so if in doubt buy the bigger one.

    Might come with - will be mentioned in the ad.
    There is a sticky for measuring clamp size.
    I don't do smileys.

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  • jayson
    jayson Posts: 4,606
    cooldad wrote:
    jayson wrote:
    The 34.9mm bracket will come with shims to make it fit the smaller 28.6mm seat tube if needed so if in doubt buy the bigger one.

    Might come with - will be mentioned in the ad.
    There is a sticky for measuring clamp size.

    Ive ordered a few over the yrs and they always have with mine everytime.
    Remedy

    Merida

    Austria 2012
  • anjs
    anjs Posts: 486
    you also need to check if its a top or bottom swing? Basically is the band above on below the mech
  • The Rookie
    The Rookie Posts: 27,812
    As has been said the aftemarket ones come with (slightly unsightly) shims to fit the smaller tubes, why not get a good used one instead and save money and get one that looks right? I have an Alivio off a 2004 chucker (28.6mm steel frame) in excellent condition but its probably worth less than a fiver!

    Simon
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • Chunkers1980
    Chunkers1980 Posts: 8,035
    From Merlin:

    Wide link design Deore M590 MTB front derailleur
    Light action top swing design
    wide pivot link design for greater torsional rigidity improves shifting response and service life
    Multi-fit compatibility means that this front derailleur will fit any frame type or seat tube size
    Cable routing can be used with frames built for top or bottom pull derailleurs
    Mega9 drivetrain compatibility
    Reinforced steel chain guide offers high strength and rigidityfor improved shifting response
    Maximum capacity of 22 teeth, and up to 48 tooth chainring
    For 66-69 degree chainstay angle

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