RX4+ Postmount Caliper DOT – Postmount caliper designed for use with Postmount type fork and frames. For use with DOT Oil systems only. Compatible with: Sram Red eTap AXS Sram Red Sram Force eTap AXS Sram Force Sram Rival Sram Apex Sram S900 Postmount Caliper Drop bar hydraulic calipers Slimline 4 piston lightweight design Monobloc design creates a stiffer caliper reducing the fuzzy lever feel and brake pad rub Available in 6 different colours DOT Oil Brake Fluid Only **Not suitable for IS Mounts**