The J-type shape was first seen on the brake rotors of race cars competing in the highest forms of motorsport. Rolloface has transferred this race-proven design for road cars and track cars. They are designed to offer strong initial bite and longevity.
The J-type groove machined into the brake rotor surface are designed to swipe hot gases and brake dust from the rotor and maintain their shape even under hard use. By contrast, the circular holes in a cross-drilled rotor have been shown to form spider cracks under repeated heavy braking usage.
What are “floating” rotors?
A floating rotor attaches to the center “hat” via rivets that allow for a minute amount of horizontal movement of the brake disc. This design helps distribute the amount of brake pad pressure being applied to both sides of the brake disc, thereby reducing the overheating that can occur when one side of the brake disc receives more pressure than the other. By helping to reduce the thermal expansion that occurs under extreme braking, rotors are less prone to warping.