What is preload?
The preload setting determines spring length. A longer spring will react even when there’s less force applied by the road, making for a softer ride that’s great on bumpier terrain. If you increase preload, which shortens the spring, you’ll end up with a firmer ride. This works best for flatter surfaces to prevent body roll when going around corners, braking and accelerating. It also helps reduce excessive vehicle movement when the vehicle is carrying passengers and cargo.