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2. Bicycle tire - Wikipedia

   en.wikipedia.org/wiki/Bicycle_tire

   If a tire is inflated to 4 bar (400 kPa; 58 psi) at sea level, the absolute internal pressure would be 5 bar (500 kPa; 73 psi) (+25%), and this is the pressure that the tire would need to contain if it were moved to a location with no atmospheric pressure, such as the vacuum of free space. At the highest elevation of commercial air travel ...

3. Cold-weather biking - Wikipedia

   en.wikipedia.org/wiki/Cold-weather_biking

   The name is a reference to the fatness of the tires used on the cycles. The wide tires can be used with inflation pressures as low as 5 psi (340 hPa) to allow for a smooth ride. [18] Surly Bikes released the Pugsley frame, in 2005, [19] and began producing Large Marge 65 mm rims and Endomorph 3.8-inch tires in 2006.

4. Fatbike - Wikipedia

   en.wikipedia.org/wiki/Fatbike

   Fatbike being ridden over snow. A fatbike (also called fat bike, fat tire, fat-tire bike, or snow bike) is an off-road bicycle built to accommodate oversized tyres, typically 3.8 in (97 mm) or larger and rims 2.16 in (55 mm) or wider, designed for low ground pressure to allow riding on soft, unstable terrain, such as snow, sand, bogs and mud. [1]

5. 29er (bicycle) - Wikipedia

   en.wikipedia.org/wiki/29er_(bicycle)

   29″ and 26″ mountain bike wheels. 29er rims have an interior diameter of 622 millimetres (24.5 in) [1] and the average 29″ mountain bike tire is (in ISO notation) 59-622 – corresponding to an outside diameter of about 29.15 inches (740 mm). The typical 26″ MTB tire has a rim diameter of 559 millimetres (22.0 in) and an outside tire ...

6. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   A sectioned, carbon–composite, rear wheel for mountain bikes. A wheel can be formed in one piece from a material such as thermoplastic (glass-filled nylon in this case), carbon fiber or aluminium alloy. Thermoplastic is commonly used for inexpensive BMX wheels. They have a low maximum tire pressure of 45 psi (3bars or atmospheres).

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).