PSB's Wave Rotor PR-11 is designed based on the average wear and tear situation of the MTBs.
The the non-circular design of the outer frame makes the disc lighter but with more surface area, which improves the heat dissipation effectively.
Friction between the brake pads and the disc generates a lot of heat. Overheated situations will cause the disc to anneal, which leads to reduction in braking performance. Drilled discs are improved in heat dissipation, with less chance of overheating.
The locations of the holes are determined by precise calculations and repeated tests, achieving the best balance between function and strength.