Einstellen von Roller-Cam Bremsen: Unterschied zwischen den Versionen

==Was ist eine Roller-Cam Bremse==

A roller-cam brake works like a centerpull caliper, but its pivots are attached directly to the frame or fork. Instead of having a transverse cable, a roller-cam brake uses a triangular cam. The brake has two see-saw like arms, pivoted in the middle on studs. The cam is pulled by the cable, which is attached to the narrow end of the triangular piece. As the cam is pulled, its sloping sides push outward on rollers which are attached to the upper end of the brake arms. Roller-cam brakes permit the use of variable ratios by making the sides of the cam curve instead of being straight. Typically this is done to make the shoes travel in toward the rim fast, then more slowly as they engage...this gives more mechanical advantage in the actual braking range of travel, while allowing the shoes to back off farther from the rim than if the mechanical advantage were consistent throughout the travel range.