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2. BVP M-80 - Wikipedia

   en.wikipedia.org/wiki/BVP_M-80

   Although many foreign experts compare M-80A with Russian BMP-1, the Yugoslav IFV is a true original design. Unlike the BMP-1 which had 6 road wheels and was armed with 73 mm gun, M-80A had 5 road wheels and had 20 mm gun. M-80A incorporates numerous elements from the French AMX-10P giving it more power and better protection over its counterpart ...

3. Street skateboarding - Wikipedia

   en.wikipedia.org/wiki/Street_skateboarding

   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.

4. Longboard (skateboard) - Wikipedia

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

   Typical longboard wheels range from 65 to 107 millimeters (2.6 to 4.2 in) in diameter. A taller wheel will have slower acceleration but a faster rolling speed. Smaller wheels have the opposite effect. The durometer of a wheel is how hard the urethane is. A softer wheel will be ultimately slower than a harder wheel on smooth surface.

5. Longboarding - Wikipedia

   en.wikipedia.org/wiki/Longboarding

   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 ...

6. 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).

7. Shore durometer - Wikipedia

   en.wikipedia.org/wiki/Shore_durometer

   Two inline skate wheels with different durometer – 85A and 83A Digital Shore hardness tester. ... If the indenter penetrates 2.54 mm (0.100 inch) or more into the ...