Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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The spacing between the adjacent chainrings is the only consideration and Shimano, Campy, FSA etc. all have similar enough spacing that shifting should be fine if you substitute the Campy for the FSA. In fact, most 9-speed cranks function perfectly with 10-speed everything else.
The only constraint is what canopus mentioned, does the Campy crank come with a bottom bracket? If it's a new Ultra Torque external bb, the cups are very cheap. If it's an older square taper you will need the appropriate Campy/ISO bottom bracket and keep in mind, the last generation Record/Chorus square taper cranks used a different spindle length and symmetry than Centaur and below.