HOPE RX4+ Caliper Complete FM Std DOT Silver Carbon The cage design facilitates easy Di2 The cage design facilitates easy bottle retrieval and return and oval mounting holes allow for fine tuning of the cage's position on most bike frames The wider stance of the arms and chainrings provides clearance for extra wide tires The RX4+ caliper supersedes the RX4 caliper and builds on 25 years’ experience designing and manufacturing hydraulic disc brakes and transfers the knowledge and skills acquired into the world of Road and Cyclocross dropbar brakes A precision CNC machined monobloc design results in a stiffer caliper to give unrivalled feel and modulation