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Calculating axle size for fixed chainline

belgiangothbelgiangoth Posts: 2,849
edited November 2008 in Road general
How do I work out what size BB axle I need to correct my chainline?


  • meagainmeagain Posts: 2,774
    I guess it's much easier if you have one fitted that is too short or too long! Being mathematically simple I'd work from +/- whatever's there now - so if ring 4mm too far out, need an 8mm shorter axle - I think!
    But I guess you'd have done that if that simple!
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  • andypandyp Posts: 8,501
    It is that simple if you know which taper your bb has - i.e. ISO or JIS.
  • itboffinitboffin Posts: 19,931
    What about chainstay clearance when selecting cranks?
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