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RX4+ Flatmount Rear +20mm DOT Caliper ? Integrated mount design to work with Flatmount Rear Mount forks only, allows the use of a 180mm/160mm rotor dependent upon frame mount type*. 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