
The long awaited Hayes Prime's finally hit the market recently, and Hayes sent me a set of the Expert version of the Prime's, with 160mm two-piece rotors, and titanium hardware. The Prime brakes, are a completely new system, with a wholly redesigned caliper and master cylinder. The brakes were designed with more power and adjustability in mind. Their trick pop cam system will give the user more adjustability, in both stroke and reach. The dead stroke adjustment, which is the lever stroke where the brake pads come in contact with the rotor, is done with a small dial that can be changed with an index finger on the fly. The tool free reach adjustment is up in its usual spot by the pivots, and is easier to use with gloved fingers. Something unique is that the dual pivots are not two fixed points, but have a constant pivot point so that the lever advantage doesn’t change with reach changes. This pivot system gives the same feel, responsiveness and performance with any stroke or reach combination. They enlarged the piston size of the calipers, so the same clamp pressure will have a noticeable increase in hydraulic power (same pull more power). They also have a top loading brake pad for easier changes. They have a two piece rotor, which uses an aluminum carrier and steel outer ring, and gives a greater torsional stiffness and lighter weight than a traditional rotor. Normal rotors are cast in a single piece, while floating rotors are cast in two pieces (rotor and carrier). The carrier bolts to the wheel, and the rotor is attached to the carrier using float buttons. The buttons allow the rotor to move laterally (float), but restrict the angular and rotational movement, and this helps with vibration issues. The Hayes Prime comes in two models, the upscale Pro and the cheaper Expert. The Pro comes with the two piece rotor, and titanium and anodized aluminum hardware. Otherwise the models are functionally the same.