Hope RX4+ SL Post Mount Brake Caliper (Sram DOT) Black HBSPC108N Hope

The Hope RX4+ SL Postmount DOT brake caliper is a high-performance 4-piston hydraulic brake caliper designed to significantly improve the power and control of SRAM-compatible road and gravel braking systems. Thanks to its ultra-rigid monoblock design and lightweight construction, it delivers more powerful, consistent braking and a better feel at the lever, while fitting perfectly on Postmount-compatible frames and forks.

Precision-machined from a block of 2014 T6 aluminum and entirely manufactured in the UK, the RX4+ SL features a new piston cap design that reduces the overall width of the caliper to improve compatibility with the most demanding frames and forks.

Product highlights:

• One-piece 4-piston design offering greater rigidity and power.
• Lightweight SL version for an excellent weight-to-performance ratio.
• New, more compact design improving compatibility with modern frames.
• Reduced parasitic friction (pad friction) and improved lever feel.
• Specific Postmount mounting for compatible frames and forks.
• Precision CNC machining in high-quality 2014 T6 aluminum.
• Available in all Hope anodized finishes.
• Simplified installation thanks to pad insertion from the top.

Key technologies:

4-Piston Monoblock The monoblock design, machined from a solid block, significantly improves caliper stiffness. This architecture limits deformation under heavy load to deliver more powerful, consistent braking and eliminate the "spongy" lever feel.

RX4+ SL Lightweight Design
The SL version has been optimized to reduce weight (slimmed-down profile) without compromising braking power or reliability. It is an ideal solution for high-end road, gravel, and endurance bikes.

Optimized Frame Compatibility
The new bore plug design reduces the overall width of the caliper to ensure better clearance with modern carbon frames and forks with limited space.

Top-entry pad loading
The Top Entry Pad system allows for quick and easy pad replacement without removing the caliper from the bike.

Technical Specifications:

SRAM lever compatibility:

Ideal use: The Hope RX4+ SL Postmount DOT is designed for road, gravel, and endurance cyclists with a Postmount frame or fork who want to improve the power, modulation, and consistency of their SRAM hydraulic brakes while enjoying a lightweight, stiff caliper with an optimized design.

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