What is a Disc Brake Adapter? Simply put, it’s a chunk of metal and two bolts that allow you to mount different sized disc rotors on your bike frame. Basically, it’s a spacer. Bigger spacers = bigger rotors. Not all disc brakes need adaptors: If a bike frame is designed for 160mm rotors and post mount brakes, and you stick to that size of rotor, no adaptor needed. That’s pretty much only the case with Post Mount.
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