SRAM Rival 22/Rival 1 Flat Mount Caliper Genuine SRAM Parts We all know that stuff happens. Sometimes parts wear out, sometimes parts break. Whatever the reason is, luckily you can replace it. The SRAM Rival 22/Rival 1 Flat Mount Caliper is a disc brake caliper assembly that is designed for SRAM Rival 22 and Rival 1 hydraulic disc brakes. They are flat mount and can be used on either the front or rear. Features Designed for SRAM Rival 22 or Rival 1 hydraulic disc brakes Can be used on the front or the rear Manufacturer's part number: 11. 5018. 041. 000 | Sram | Rival 22/rival 1 Flat Mount Caliper | Black | 18Mm, Single Caliper Front Or Rear