Bicycle Mechanics - Dura Ace Crank Switch

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.

PDA

View Full Version : Dura Ace Crank Switch

dgsca

04-05-08, 01:24 PM

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

JiveTurkey

04-05-08, 01:47 PM

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.