SRAM Disc Brake Adapter
Depending on what size rotor you use, and what your frame/fork mount is, you will need a brake adapter to properly space your disc brake caliper.
For example, if your fork has a Post Mount 160mm, and you want to use a 200mm rotor, you would need a PM 40mm adapter.
There are two standards for disc brake mounts: IS: 51mm International Standard, PM: 74mm Post Mount
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