Hope
The Hope RX4+ SL Brake Caliper is a hydraulic disc brake caliper designed for road bikes, cyclocross, and gravel bikes. It features a one-piece milled caliper, 4-piston design, and is compatible with Shimano Dura-Ace, Ultegra, and GRX brake systems.
Checked Jul 9, 2026 14:32
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The Hope RX4+ SL Brake Caliper is the successor to the RX4 brake caliper, built on 25 years of experience in developing hydraulic disc brakes. Its one-piece milled caliper enables efficient transfer of braking force, providing a positive bite point. The new bore cap design decreases the overall width of the caliper for better frame compatibility. The monoblock construction results in a stiffer caliper, reducing imprecise braking feel and brake pad rubbing. It is suitable for 140mm, 160mm, and 180mm rotors and uses mineral oil brake fluid. The caliper features a slim 4-piston lightweight design and pads are mounted from the top for easy replacement.
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