Hayes mx expert disc brake 160mm rotorhayes mx series have long been the go to answer for reliable stopping power in a mechanical set up from intitial set up to the ride itself the mx brake from hayes is the ideal platform for flat bar mountain and pavement bikes the mx expert is their tried and true mechanical disc brake platform an evolution of the mx4 formerly known as the mx5 features torsion spring internal low effort more efficient braking compatible with existing hayes mechca