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A bicycle disc brake is a braking system that uses a metal rotor attached to the wheel hub, which is clamped by a set of brake pads to slow down or stop the bike. The rotor spins with the wheel, and when the rider engages the brake lever, hydraulic or mechanical force pushes the brake pads against the rotor. This creates friction, reducing the wheel's speed. Disc brakes are favored for their superior stopping power, especially in wet or muddy conditions, as they are less affected by environmental factors compared to traditional rim brakes. They provide better modulation, meaning more precise control over braking force, and are more durable for mountain biking and road cycling, offering consistent performance over time.