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Bearings consist of 6, 7, or 8 balls enclosed in races between two shields encased in a disc-like body. Bearings can be measured by an ABEC rating. Skateboard bearings typically come in sets of eight and are inserted into both sides of the wheel; two bearings for each of the four wheels.
Most boards measure 84 to 150 centimeters (33 to 59 in) in length while widths vary from 22.8 to 25.4 cm (9.0 to 10.0 in). There are several longboard shapes, such as pintails, swallowtails, flat-nose riders, drop-through decks, drop decks and boards with the same shape as a conventional skateboard.
A fingerboard is a scaled-down replica of a skateboard that a person "rides" with their fingers, rather than their feet. A fingerboard is typically 100 millimeters (3.9 in) long with width ranging from 26 to 55 mm (1.0 to 2.2 in), with graphics, trucks and plastic or ball-bearing wheels, like a skateboard. [1]
Each skateboard wheel is mounted on its axle via two ball bearings. With few exceptions, the bearings are the industrial standard "608" size, with a bore of 8 or 10 mm (0.315 or 0.394 inches) depending on the axle, an outer diameter of 22 mm (0.866 inches), and a width of 7 mm (0.276 inches).
The contemporary shape of the skateboard is derived from the freestyle boards of the 1980s; these boards have a largely symmetrical shape and are relatively narrow. [23] [24] [25] Decks can be as narrow as 7.5" or as wide as 8.75". Length ranges from 760 to 830 millimetres (30 to 33 in).
Makana Cummins in California. Longboarding is a variation of skateboarding typified by the use of longer boards ("decks") with longer wheelbases and softer wheels.While longboards vary widely in shape and size, compared to street skateboards longboards are designed to be more stable at speed and to have more traction due to larger wheel sizes and softer wheel durometers.
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Bearing manufacturing precision generally run from ABEC-1 to ABEC-11, and some skate bearings are additionally designed to be "loose" to minimize ball rolling friction. Various grades of steel offer better hardness, rust resistance etc. Bearings with ceramic balls (and races) have been available since the late 1990s.
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