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2. Tire code - Wikipedia

   en.wikipedia.org/wiki/Tire_code

   There is the rare exception of metric-diameter tires, such as the use of the 390 size, which in this case would indicate a rim of 390 mm in diameter. Few tires are made to this size currently. The number may be longer where a half-inch size is used, for example many heavy transport trucks now use 22.5-inch tires. [14] [15]

3. Radial tire - Wikipedia

   en.wikipedia.org/wiki/Radial_tire

   A radial tire (more properly, a radial-ply tire) is a particular design of vehicular tire. In this design, the cord plies are arranged at 90 degrees to the direction of travel, or radially (from the center of the tire). Radial tire construction climbed to 100% market share in North America following Consumer Reports finding the superiority of ...

4. Contact patch - Wikipedia

   en.wikipedia.org/wiki/Contact_patch

   Contact patch. The contact patch is the portion of a vehicle's tire that is in actual contact with the road surface. It is commonly used in the discussion of pneumatic (i.e. pressurized) tires, where the term is used strictly to describe the portion of the tire’s tread that touches the road surface. The term “footprint” is used almost ...

5. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces. The offset is the distance from the wheel's true centerline (half the width) to the wheel's ...

6. Boat trailer - Wikipedia

   en.wikipedia.org/wiki/Boat_trailer

   Boat trailer. An empty boat trailer. A boat trailer is designed to launch, retrieve, carry and sometimes store boats. As of 2024, the cost of a boat trailer can be anywhere between $700 to $8000, depending on the size and number of axles the trailer has. [ 1]

7. Ground pressure - Wikipedia

   en.wikipedia.org/wiki/Ground_pressure

   Ground pressure is the pressure exerted on the ground by the tires or tracks of a motorized vehicle, and is one measure of its potential mobility, [1] especially over soft ground. It also applies to the feet of a walking person or machine. Pressure is measured in the SI unit of pascals (Pa). Average ground pressure can be calculated using the ...