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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 04-05-08, 01:24 PM   #1
dgsca
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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?
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Old 04-05-08, 01:47 PM   #2
JiveTurkey
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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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