The constant heating and cooling of the brake rotor can cause heat checking. The sharp edges on the hole or countersink creates a stress point, increasing the possibility of a crack formation.

Straight Drilled Hole 

A high stress and heat build up area forms at the intersection of the rotor and drilled edge. 

Countersunk Hole 

Countersinking increases the external surface area of the hole, thus reducing heat, but still contains edges prone to stress and heat build up.

Radius Hole 

The Radius Chamfer increases the hole cooling area thus reducing heat, but still contains sharp edges. 

SP *Sinusoidal Curved Chamfered  Hole 

Absolutely no sharp edges. The smooth design promotes cooling and minimizes stress, reducing the possibility of heat checking while increasing both rotor and pad life.

    *The Sinus-Curve is an example of a design inspired by mathematical principles. SP Performance brings you this unique product in which geometry and art are united to provide the ultimate in performance and style.