HOPE RX4+ Caliper Complete FMF+20 DOT Black GRX this Wahoo Hub this Wahoo The TechWALL+ Road carcass improves reliability against punctures without affecting the weight of the tire while the special SmartEVO Compound enhances the grip performances both on wet and dry asphalt compared to our previous cycling compounds 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