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Two inline skate wheels with different durometer – 85A and 83A Digital Shore hardness tester. The Shore durometer is a device for measuring the hardness of a material, typically of polymers. [1] Higher numbers on the scale indicate a greater resistance to indentation and thus harder materials. Lower numbers indicate less resistance and softer ...
The superficial Rockwell scales use lower loads and shallower impressions on brittle and very thin materials. The 45N scale employs a 45-kgf load on a diamond cone-shaped Brale indenter, and can be used on dense ceramics. The 15T scale employs a 15-kgf load on a 1 ⁄ 16-inch-diameter (1.588 mm) hardened steel ball, and can be used on sheet metal.
Skateboard wheels come in diameters between 48 mm and 62 mm and are made of polyurethane, with a hardness above 80A. Some wheels will be made harder than measurable on the "A" scale and will have durometers up to 84B (about 104A). Skaters must make a compromise when choosing their wheels.
Most boards are about 7 + 1 ⁄ 4 to 8 inches (180 to 200 mm) wide and 30 to 32 inches (760 to 810 mm) long. The wheels are made of an extremely hard polyurethane, with hardness approximately 99A. The wheel sizes are relatively small so that the boards are lighter, and the wheels' inertia is overcome quicker, thus making tricks more manageable.
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).
Inline skate wheels with different diameters and profiles. Wheel sizes vary depending on the skating style. 44–72 mm (1.73–2.83 in) for aggressive skating. 47–80 mm (1.85–3.15 in) for roller hockey skating. 68–72 mm (2.68–2.83 in) for artistic inline skating. 72–80 mm (2.83–3.15 in) for freestyle slalom skating and downhill skating.
ISO 18265: "Metallic materials — Conversion of hardness values" (2013) ASTM E140-12B(2019)e1: "Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness" (2019)
Wheels: Usually made of polyurethane and sized between 39 and 70 millimeters in diameter, their hardness is measured by durometer, a number ranging from 0 to 100. Soft wheels have a durometer of about 85, hard wheels have a durometer of 98 or higher. .63 mm wheels are usually reserved for longboards , which go significantly faster and benefit ...
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