Middleburn chain line

plugp7
plugp7 Posts: 298
edited August 2008 in MTB workshop & tech
Was thinking about upgrading my XT square taper to a Middleburn chain set when I realised that the Middleburn has a 48mm chainline compared with Shimano standard 50mm.
So the question is, do I need a new 117mm bottom bracket to compensate?
Anyone else had issues or problems doing this?

Steve
Cotic Soul 26 inch. Whyte T130

Comments

  • artillerydave
    artillerydave Posts: 715
    the 2mm will not make much difference unless you run the gears in unrecommended combos. other than that it will just mean a slight fettle with your front mech.
  • plugp7
    plugp7 Posts: 298
    Just an update here.
    I fitted the Middleburn chainset and ran it with the standard 113mm bottom braket.
    What a total mess! The shifting was a disaster even with a new front mech.
    I got the same advice from other sources (LBS). I can only think that some riders will put up with really dodgy shifting.
    I fitted a cheap VP 118mm bottom braket and hey preto. Perfect shifting.
    The set up, 46 36 24 rings with 11 to 32 cassette.
    Read and learn.
    Cotic Soul 26 inch. Whyte T130

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