Calculating axle size for fixed chainline — BikeRadar
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Calculating axle size for fixed chainline
edited November 2008
How do I work out what size BB axle I need to correct my chainline?
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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It is that simple if you know which taper your bb has - i.e. ISO or JIS.
What about chainstay clearance when selecting cranks?
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