With the ever changing standards in scootering, Tilt decided to create a fork to be compatible with the bigger wheels that are quickly becoming popular. The 30x120 Fork features the classic TILT look with improved compatibility. Tilt PRO SCOOTER FORKS are a pro scooter fork that work with the following types of compression: SCS,HIC,TCS. When you purchase forks, you will need to purchase a compression system (listed previously) that is compatible with your forks, as well as scooter bars that are compatible with the selected compression system. Tilt forks are durable forks and can be ridden on the street or at the park. The Tilt pro scooter forks are compatible with the following wheel diameters: 100mm,110mm,115mm,120mm. Tilt pro scooter forks are an extremely versatile fork and are compatible with any of the following wheel core widths: 24mm,26mm,28mm,30mm. To swap out different width wheels, you will need compatible spacers for the wheel width selected.