Any question answered...

Why do some groupsets come with one dual pivot brake and one single pivot, and which should be used where? Dual pivot on the front for better braking, or on the back to couter the effect of a longer cable?

Out of the box they will only go one way due to 'axle' length. I think Campag were doing single pivot rear coz it's lighter with better modulation and you dont' need huge braking on the rear anyway since the front does most of the work.

EDIT: Oh, I see I was a page behind every fuckers already had a go. stops ignoring forum