Bushings Bushings are the rubber parts of the truck that assist it in turning smoothly. All trucks come with their own bushings as standard but you can also swap them out for different ones. The advantage to swapping you bushings is that since they are the most wearing part of the truck, you can replace them without having to replace the whole truck. Bushings work on the same hardness scale as skateboard wheels, durometer. The softer the bushings, the more easily they will turn. Harder bushings will provide more stability.