Rear Brake Discs 330x32mm (Slotted, Floating) - #BP-E-13-D

Below we explain the difference between drilled and slotted discs.

Slotted:
Slotted rotors offer improved bite (initial onset of braking) and slightly higher friction level than smooth rotors. Slots prevent reduction in friction due to pad outgassing or brake dust trapped between pads and rotors. Pad coefficient of friction is maintained over the lifetime of the pads, since slots shave away glaze formation and expose fresh pad surface each time brakes are applied. Slotted rotors are by far the number one choice for cars used in competition or open track events. Disadvantages include slightly reduced pad life, some low frequency rumble and pedal flutter when braking hard from high speeds.

Drilled:
Drilled rotors offer slightly more bite and friction than slotted rotors. As with slotted rotors, pad coefficient of friction remains consistent over their lifetime. Wet bite is improved over plain and slotted rotors, so these may be the best choice for areas with heavy rainfall. Weight is reduced by about 0.2 pounds per rotor, depending on size and drill pattern. Disadvantages include possible uneven rotor wear, typically concentric groove formation, although this is mostly an aesthetic concern. A major disadvantage is accelerated formation and spreading of cracks under racing conditions. For this reason, drilled rotors should be avoided for track cars, unless required by the rules. A common piece of misinformation is that they have lower performance than smooth rotors, due to reduced surface area and are for looks only. This is false.

A 2-piece rotor construction not only allows the rotor to be significantly lighter, but is also allows us to make it a fully floating piece. A 1-piece rotor and even 2-piece bolted together rotor are fixed to each other with no allowable movement. As the rotor heats up the iron will expand. The friction ring will actually grow slightly larger in diameter. The hat will also grow as the rotor heats up. In time this leads to weakening the rotor and ultimately leading to cracking and warping. By using a special drive pin assembly with an elongated hole in the friction ring, we can allow the hat to “float” from the rotor, therefor making the hat and the rotor to expand and contract freely and un-opposed to one another. This allows you to run the rotor through countless heat cycles without having to worry about warping or cracking.

Please measure the Center Bell mounting points to determine if you have an M6 (6.3 mm) or M8 (8.3 mm) Center Bell connection.