Bicycle hub plays a very important role, it is the center of rotation of the wheel and directly affects the roll and effort expended by the cyclist. The front hub and the rear hub are fundamentally different in that the transmission sprocket must be attached to the rear. According to the type of stars, the bushing can be for a freestyle (ratchet) or for a cassette. The mechanism for attaching the ratchet and cassette to the hub is different. Bicycle hubs can be attached with eccentrics or axle nuts. They also differ in material and manufacturing method (aluminum and steel bushings), they can be under the rim brake and under the disc. The disc brake can be mounted with 6 bolts or a centerlok. Still, the main thing is the bearings. There can be tapered bushings with loose bearings or more durable bushings with industrial bearings. Among the well-known manufacturers of bicycle hoodies Shimsno, Quando, Sunrace, etc.