The front fork is a key component of any bicycle and determines its overall quality. Suspension forks use compressed air or a spring system to insulate the rider from the roughness of the terrain. Air suspension is the more common option, despite it being more expensive than spring suspension; moreover, the air pressure can be adjusted to the weight of the rider. Spring suspension is the cheaper option and provides a slightly more sensitive damping; however, one disadvantage is that the spring force depends on the weight of the rider, and sometimes the spring can harden at low temperatures.