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Old 06-24-10, 01:25 AM
  #3  
dabac
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The grey tube is there to ensure that the legs of the triangle are equally long. With it in place the geometry of the brake will be in the Shimano-approved ballpark for decent performance. Straddle wires can be set up in a few different ways, and as long as the geometry stays the same there's no functional difference between them.
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