Hope RX4+ SL Caliper Complete - FM Std - DOT - Silver

The Hope RX4+ SL is the latest evolution of Hope's renowned 4-piston road and gravel brake caliper, delivering increased braking power, improved modulation and enhanced frame compatibility. CNC machined from a single piece of 2014 T6 aluminium, the monobloc construction creates a stiffer caliper body for a firmer lever feel, reduced pad rub and more consistent braking performance.

Designed specifically for DOT brake fluid systems, the RX4+ SL is the ideal upgrade for SRAM hydraulic road and gravel groupsets. Its slimline 4-piston design uses differential piston sizing to provide excellent modulation alongside powerful stopping performance, making it equally at home on road, gravel and adventure bikes.

For 2026, Hope has refined the original RX4+ design with a new bore cap arrangement that reduces the overall width of the caliper, improving clearance around frames and forks where space is limited. The RX4+ SL also benefits from easier servicing and improved bleed access while retaining full compatibility with existing RX4+ brake pads and fittings.

Features:
- Flat Mount standard fitment
- Compatible with DOT 4 and DOT 5.1 brake fluid systems
- Lightweight 4-piston monobloc caliper construction
- CNC machined from 2014 T6 aluminium
- Improved frame and fork clearance thanks to narrower SL design
- Top-entry pad installation
- Available in Hope anodised colour options
- Made in Barnoldswick, UK

Compatible with:
- SRAM Red eTap AXS
- SRAM Red HRD
- SRAM Force eTap AXS
- SRAM Force HRD
- SRAM Rival eTap AXS
- SRAM Rival HRD
- SRAM Apex HRD
- SRAM S900 hydraulic systems

Mount adapter not supplied. Rotor compatibility depends on frame/fork mount configuration.

The DOT version should only be used with SRAM hydraulic levers, while Shimano and Campagnolo users should choose the mineral oil version.