![]() ![]() Rear axles typically have diameters of 10 or 12 mm. Diameters for front thru axles include 20 mm, 15 mm, 12 mm, and 9 mm. Some axles have integrated cam levers that compress axle elements against the fork leg to lock it in place, while others rely on pinch bolts on the fork leg to secure it. Thru axle - a removable axle with a threaded end that is inserted through a hole in one fork leg, through the hub, and then screwed into the other fork leg.(found on some single speed hubs, Cannondale Lefty hubs) Bolt - the axle has a hole with threads cut into it and a bolt can be screwed into those threads. ![]() (often found on track, fixed gear, single speed, BMX and inexpensive bikes) Nut - the axle is threaded and protrudes past the sides of the fork/frame.Quick release - a lever and skewer that pass through a hollow axle designed to allow for installation and removal of the wheel without any tools (found on most modern road bikes and some mountain bikes).The axle is attached to dropouts on the fork or the frame. Hub shells can be one-piece with press-in cartridge or free bearings or, in the case of older designs, the flanges may be affixed to a separate hub shell. The hub shell typically has two machined metal flanges to which spokes can be attached. It consists of an axle, bearings and a hub shell. A typical modern wheel has a metal hub, wire tension spokes and a metal or carbon fiber rim which holds a pneumatic rubber tire.Ī hub is the center part of a bicycle wheel. The first bicycle wheels followed the traditions of carriage building: a wooden hub, a fixed steel axle (the bearings were located in the fork ends), wooden spokes and a shrink fitted iron tire. The first wheel to use the tension in metal spokes was invented by Sir George Cayley to achieve lightness in his 1853 glider. A pair is often called a wheelset, especially in the context of ready built "off the shelf" performance-oriented wheels.īicycle wheels are typically designed to fit into the frame and fork via dropouts, and hold bicycle tires. Bicycle wheel with wooden rim Nipples Spokes Cross-section of a rim A Shimano Dura-Ace freehub-style hubĪ bicycle wheel is a wheel, most commonly a wire wheel, designed for a bicycle. For the Marcel Duchamp installation, see Bicycle Wheel. ![]()
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