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  1. #1
    Junior Member
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    Dura Ace Crank Switch

    I am running a 170 mm DA crank (7400 I think) with DA 7 speed drive train. I would like to switch to 172.5 cranks. What type of issues will I face if I run a diffrent crank set? What chain issues might pop up? Or, am I fine running any DA crank and keep with a seven speed chain?
    Thanks all,
    dgsca

  2. #2
    Low car diet JiveTurkey's Avatar
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    Aug 2007
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    Corvallis, OR, USA
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    2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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    Unless it's the exact model crank, there's a possibility you'll need to replace the bottom bracket because 1) it may use a different spindle type (square taper, splined, external/integrated) or spindle length. BB sizes: http://sheldonbrown.com/bbsize.html

    The bottom bracket type must match and the length should match (for optimal chain line) the crank, but the chainrings won't care too much about the chain that is used on them.

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