SRAM Red AXS Post Mount Caliper Top-Tier Stopping, Your Frame's Way Most road frames have moved to flat mount, but not all of them. If yours runs post mount and you want RED AXS-level braking, this caliper is the direct answer. It pairs with RED AXS hydraulic levers and brings the same stopping power and modulation to post mount frames that RED AXS riders on flat mount frames already rely on. The caliper runs on DOT fluid and uses SRAM's Bleeding Edge port design, which keeps brake bleeds clean and straightforward when service day comes around. Features Post mount interface fits frames and forks with 74mm post mount spacing without adapters RED AXS groupset compatibility pairs directly with RED AXS hydraulic shift-brake levers for top-tier road braking performance Bleeding Edge technology simplifies brake bleeds and keeps the system clean during service DOT brake fluid use correct fluid type for system compatibility and long-term seal integrity | Sram | Red Axs Post Mount Caliper Silver