SRAM Post Mount 20mm Disc Brake Spacers with Titanium Bolts
Depending on what brake and rotor you use, and what your frame/fork mount is, you will need a brake adapter to properly space your disc brake caliper. Includes CPS and Standard Hardware with titanium bolts.
For example, if your fork has a Post Mount 160mm, and you want to use a 180mm rotor, you would need 20mm worth of spacers.
Standard hardware is used with brake calipers that have +5mm offset in the mounting tabs whereas the CPS hardware is used with brake calipers that have inline mounting tabs.
View the SRAM Caliper Mounting Specifications document for more specific information.