Number 9 in our FAQ series:
WHY DO YOU RECOMMEND SMALLER ROTORS THAN YOUR COMPETITORS?
The function of the rotor is twofold. First, it provides a lever to magnify torque output of the caliper. Second, it provides a “heat sink”, to remove the heat generated during braking. Since our caliper provides greater clamping force, then the need for a large diameter rotor is not necessary.
Rotating weight is the most undesirable weight in a car. One pound of rotating weight is the equivalent of 10 pounds of sprung weight to the “feel” of the car. By installing larger than necessary rotors you will slow the acceleration and deceleration of the vehicle. If you want it because it looks cool, then do it. Just know that the car will not perform as well with it.