These 2-in-1 electric skateboards come with a conversion kit, which includes a complete set of wheels, belts, gears, and covers - everything that you need to transform a street board to an all-terrain or vice versa. Each conversion kit is different, so make sure you have a read of the product description before you make a purchase. With this conversion kit, you have everything that you need to turn your off-road board into a street skateboard and back.