9D Herman Drive. Simsbury, CT 06070 Toll Free: (877) 651-3517 Monday - Friday, 9 a.m. - 5 p.m. Eastern Standerd Time
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Advanced Drilling methods put SP Performance Brake Rotors above the rest in quality, performance, reliability and appearance.
Straight Drilled Hole With No Countersink:
Cross Dilled Holes without a countersink are very prone to cracking. Sharp edges formed at the surface of the hole builds heat during braking. This heat around the hole causes high stress areas that can cause rotors to heat check and eventually crack.
The countersunk method is the most commonly used by other manufacturers. The countersinking increases the external surface area of the hole, thus reducing some of the heat buildup. The sharpness of the edges is also reduced, but it's still prone to stress and heat buildup, which can cause the rotor to eventually crack.
The Radius Chamfered Hole greatly increases the hole surface area thus reducing heat, but still contains very sharp edges at the braking surface intersection. Those sharp edges build stress and heat and can also cause the rotors to crack.
Compare Our Advanced Chamfering Technology
SP Performance Sinusoidal Curved Chamfered Hole:
SP Performance Advanced Chamfering Method
We are so sure of our drilling process, that we offer a lifetime guarantee that the rotors will not crack.