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Bicycle brake cable: see Cable; Bottle cage: a holder for a water bottle; Bottom bracket: The bearing system that the pedals (and cranks) rotate around. Contains a spindle to which the crankset is attached and the bearings themselves. There is a bearing surface on the spindle, and on each of the cups that thread into the frame.
Bearing balls are manufactured to a specific grade, which defines its geometric tolerances. The grades range from 2000 to 3, where the smaller the number the higher the precision. Grades are written "GXXXX", i.e. grade 100 would be "G100". [3] [4] Lower grades also have fewer defects, such as flats, pits, soft spots, and cuts.
Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.
A bicycle wheel is a wheel, most commonly a wire wheel, designed for a bicycle. A pair is often called a wheelset, especially in the context of ready built "off the shelf" performance-oriented wheels. Bicycle wheels are typically designed to fit into the frame and fork via dropouts, and hold bicycle tires.
[4] [5] Sinyard started importing Italian bike components which were difficult to find in the United States, [3] but the company began to produce its own bike parts by 1976, starting with the Specialized Touring Tire. [5] [6] In 1981, the company introduced its first two bikes: the Sequoia, a sport-touring design, and the Allez, a road bike. [7]
Working principle for a ball bearing; red dots show direction of rotation. A four-point angular-contact ball bearing. A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It ...
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Quality Bicycle Products (QBP) is a large distributor of bicycle parts and accessories in the bicycle industry, based in the United States, [2] with revenues of $150 million in 2008. [ 3 ] [ 4 ] In addition to wholesaling bicycles and components from other manufacturers, QBP owns and manufactures several brands of its own.