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Dual-Pivot
A type of sidepull brake caliper. The dual-pivot design was originated by Altenburger in the 1960's, and popularized by Shimano in the 1990's.
The main feature of dual-pivot brakes is that they are easier to keep centered, due to the way the arms are linked together. They can have more mechanical advantage (and a resulting rest position closer to the rim) than conventional sidepulls. Newer designs permit fine tuning the centering of the arms by simply turning a screw.
The principal disadvantage of dual-pivot brakes is that they don't track imperfect rims as well as single-pivot sidepulls, possibly causing pulsating braking.
Thanks to Mark McMaster for his help with this entry.
