Brake rotors might come in standard sizes, but the diversity in patterns and shapes is immense.
Some brake rotors have smooth edges. Others have hooks or a
swirly shape. And most brake rotors, have holes punched into the braking
Why aren’t mountain bike brake rotors mostly a solid shape? It is all about reducing temperature build-up and improving brake performance. Cutting holes into the brake rotor enhances airflow and prevents excess heat from ruining your brake system’s lever feel or power.