Axles come in steel, aluminum or titanium. Some hubs use a carbon fiber middle section to save weight. Rear hub bodies and freewheel bodies are made from aluminum because it is both light and stiff. This measurement depends on the frame design, so be sure to find out what size rear hub your bike requires.
Rear hubs are sized according to the diameter and length of the rear axle (measured in millimeters). This design does not require a derailleur, instead using a system of springs and gears housed within the hub to provide variable resistance. Internally geared rear hubs, although rare, are also an option. Standard mountain bike hubs use a freewheel design, which has a ratcheting body attached to the driveside of the hub onto which the cassette mounts. This is either done by use of a driver or a modified freewheel. Singlespeed specific rear hubs are built to accommodate only one gear. There are three types of mountain bike rear hubs - singlespeed, freewheel and internally geared. Rear hubs are available in a variety of sizes, designs and colors to excel in any mountain bike application. The wheel itself spins on bearings within the hub around an axle. Modern mountain bikes use rear hubs equipped with a freewheel, upon which the cassette is mounted. What you hear is the sound of a ratchet mechanism's pawls clicking off of the hub's engagement points. That melody does, however, serve a purpose.
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How to choose a mountain bike rear hub: Rear hubs are the only part of a mountain bike where constant noise is not a nuisance.
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