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