2 piece rotors are 2 piece or floating because they separate the contact surface from the hat. That allows the rotor to expand independently from the hat. Here's an excerpt from the racingbrake site.
Quote:
Advantages:
- Lighter rotor (12-16% weight reduction varied with the size and design) than original one-piece rotor – meaning lower spinning weight.
- Cooler disc - due to higher heat dissipation rate of aluminum hat as compared to cast iron
- True full floating design (unlike others out in the marketplace) allows the disc to expand and contract freely without stressing the hat. This helps prevent the disc from warping or cracking.
- Allows consumers to replace only the rotor ring, while reusiing the hat. Although the initial cost of two-piece rotors is higher than one-piece rotors, the lifetime operating cost could be lower.
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