RCS MASTER CYLINDERS With this new patented device, the rider can set the brake lever pivot point at one of two distances, 18 or 20 mm, simply by turning a roller cam located on the front of the lever clevis. With the RCS ? Ratio Click System ? the change from one setting to another is simplicity itself, and the lever ratio can be adapted to the different characteristics of the braking system, the ride or the conditions: for example, dry or wet, road surfaces offering greater or lesser degrees of grip, riding style, and so on?