Hope RX4+ Disc Brake Caliper – Rear Flat Mount Direct +20mm Mineral Oil Orange. The Hope RX4+ mineral oil type caliper builds on 25 years of experience designing and manufacturing hydraulic disc brakes and transfers that knowledge into the world of road and cyclocross drop bar brakes. A precision CNC machined monobloc design results in a stiffer caliper to give unrivaled feel and modulation.

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