Suspension bushes on a motorcycle are rubber or polyurethane components that fit between the suspension components, such as the swingarm and the frame or the shock absorber and the linkage. They act as dampers, reducing vibrations, noise, and friction, while allowing for smooth movement and articulation of the suspension system. These bushes are crucial for maintaining ride comfort, handling stability, and overall suspension performance. Properly functioning suspension bushes ensure that the motorcycle's suspension system operates efficiently and contributes to a smoother and more controlled ride.