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SHIMANO "DUAL PIVOT" SIDE-PULL BRAKES - An OverviewIn Shimano's Dura-Ace, Ultegra, and 105 SC series brakes, there exists a "Dual Pivot Brake". It's a side-pull brake. These brakes have three arms that form the caliper. The arm nearest the bike (1) which is held in place by the pivot bolt serves as a mounting for the arm farthest from the bike (3). Between these two is another arm (2) held in place by the pivot bolt. Arm 2 works just the way the short pivot arm has always worked. Arm 3, holding the brake pad, has a pivot bolt half way between the traditional brake and the brake pad, which is fixed to arm 1. Using the dual pivot system Shimano has shortened the travel on the long arm. The brakes respond faster, remain centered, and require fewer adjustments. SHIMANO ULTEGRA (6403) DUAL PIVOT BRAKESET
This Shimano road racing brakeset fulfills all the requirements. It's responsive and easy to adjust, thanks to the Dual Pivot system, it has the cam quick release (so you can use brakes after the wheel is out of true), convenience adjusters, light weight, and it's affordable. These are a part of the Shimano Super SLR system, the dual pivot shortens the necessary cable pull length and travel distance of the arms. In doing so it increases the actual power applied to the brake itself. The pivot bolt has a thrust bearing to reduce friction. The calipers have low profile shoes and a plastic tire guide molded into the pad holder. The levers are aero styled, SLR and Super SLR compatible. They have built in return springs, so the caliper spring doesn't wear out and they are made for full sized hands. Levers come with Black hoods. Steel parts are chromed, aluminum parts are painted Ultegra silver. Weight of the brakeset is 819 grams as a complete set (calipers-405 grams, levers-263 grams, and cables-151 grams with aero cable shroud). Available as short reach (39-49mm) only. Specify color.
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