Hope
The Hope RX4+ SL Flat Mount Front Brake Caliper is a high-performance, 4-piston hydraulic brake designed for road and gravel bikes with Flat Mount forks, offering increased power, modulation, and control.
Checked Jul 16, 2026 15:03
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The Hope RX4+ SL Flat Mount Front Brake Caliper is a high-performance, 4-piston hydraulic brake caliper designed for front Flat Mount forks. It offers a significant increase in power, modulation, and control compared to traditional road calipers. The CNC-machined monoblock design, combined with four pistons, optimizes the assembly's rigidity to improve lever feel while reducing unwanted pad friction. The +20 mm integrated mount allows for the use of 160 mm or 180 mm rotors depending on the fork's mounting standard. This brake caliper is compatible with Shimano Dura-Ace, Ultegra, and GRX systems.
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