The rear brake bolt is tangential to the tire diameter, so the brake-tire distance increases as the brake gets farther away from the brake bridge. The front brake bolt, because of the fork offset, is not tangential, and the brake-tire distance gets smaller as the brake gets farther forward of the fork crown. Fork crowns are thicker than brake bridges, so there is less brake-tire clearance in front than in back. The difference is non-trivial. A constucteur tasked with building a fork for a bike that will have dual-pivot brakes would do well to angle the bottom of the steerer and fork crown and drill the brake bolt hole such that it is tangential to the tire circumference.
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