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2. Skateboard - Wikipedia

   en.wikipedia.org/wiki/Skateboard

   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).

3. List of skateboarding terms - Wikipedia

   en.wikipedia.org/wiki/List_of_skateboarding_terms

   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.

4. ABEC scale - Wikipedia

   en.wikipedia.org/wiki/ABEC_scale

   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.

5. Fingerboard (skateboard) - Wikipedia

   en.wikipedia.org/wiki/Fingerboard_(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]

6. Longboard (skateboard) - Wikipedia

   en.wikipedia.org/wiki/Longboard_(skateboard)

   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.

7. Street skateboarding - Wikipedia

   en.wikipedia.org/wiki/Street_skateboarding

   Skate bearings come in one size. They are push-fit and can be serviced and installed in rubber skateboard wheels by hand or by using a tool. Usually consisting of a steel casing and steel or ceramic ball bearings, skate bearings are rated by ABEC, may come with a waterproof race guard, and are normally lubricated with grease.