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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.
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).
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.
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.
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.
Aerozine ceramic external bottom bracket bearing cups for BSC/ISO standard, that is M34.798×1.058 mm (1.37″-24 TPI) threads and a 68 mm wide bottom bracket shell. The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely.
Roller bearings are the earliest known type of rolling-element-bearing, dating back to at least 40 BC. Common roller bearings use cylinders of slightly greater length than diameter. Roller bearings typically have a higher radial load capacity than ball bearings, but a lower capacity and higher friction under axial loads.
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