The video shows a close-up of a bicycle's rear wheel and brake system. The wheel is spinning rapidly, indicating that the bicycle is in motion. The brake is engaged, as evidenced by the spinning wheel slowing down. The camera angle is from the side of the bicycle, and the focus is on the wheel and brake mechanism. The bicycle appears to be a mountain bike, given the thick tires and sturdy frame. The brake system is likely a disc brake, given the presence of a rotor and caliper. The video does not show any other part of the bicycle or the rider, so the context of the ride is unknown.