that can be catered for in custom or stock boards from a variety of manufacturers. Trucks Trucks are the components made up of a hanger, damping and/or spring system, and axles which attach the wheels to the deck. They also have the mechanisms required to allow the board to turn. Skate trucks Skate trucks have a rigid axle and a top hanger, with a single bolt and bushings, also called rubbers or grommets, that provide the cushion mechanism for turning the mountainboard. The bushings cushion the truck when it turns. The stiffer the bushings, the more resistant the mountainboard is to turning. The softer the bushings, the easier it is to turn. A bolt called a kingpin holds these parts together and fits inside the bushings. Thus by tightening or loosening the kingpin nut, the trucks can be adjusted loosely for better turning and tighter for more control. Skate-style mountainboard trucks are similar to skateboard trucks but more robust and with a longer axle. Channel trucks Channel trucks are common on mountainboards, and are made up of an axles mounted to the truck bottom piece, which is suspended from a top hanger by a kingpin. They are mounted to the deck using nuts and bolts through the hanger part, on an angle, (usually 35°). When the board is tilted laterally the axles turn together to angle the wheels in the direction of the turn. Two polyurethane dampers sometimes known as "egg shocks" are mounted between the hanger and the axle housing on each truck to provide resistance to the lean of the rider during turning. Springs are mounted in the same place with the dampers inside them. The 'shocks' present in channel trucks are there to dampen the turning system, and help reduce the oscillations of the trucks on the board commonly described as speed wobble. The springs are there to return the deck to centre after a turn has been performed, neither are there to provide suspension between the deck and axles. They have a kingpin that can't move vertically which prevents this. Also, the effectiveness of springs as employed in current (2009) channel truck designs is open to debate. In a "Coil over Oil" shock, the extension of the spring is dampened as well as contraction. In a channel truck design, this is not the case as the damper sits freely inside the spring—therefore only contraction is dampened,