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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. M939 series 5-ton 6×6 truck - Wikipedia

    en.wikipedia.org/wiki/M939_series_5-ton_6×6_truck

    The M939 is a 5-ton 6×6 U.S. military heavy truck. The basic cargo versions were designed to transport a 10,000 pounds (4,500 kg) cargo load over all terrain in all weather. Designed in the late 1970s to replace the M39 and M809 series of trucks, it has been in service ever since. The M939 evolved into its own family of cargo trucks, dump ...

  4. Caterpillar 797 - Wikipedia

    en.wikipedia.org/wiki/Caterpillar_797

    Caterpillar 797. The Caterpillar 797 is a series of off-highway, ultra class, two- axle, mechanical powertrain haul trucks developed and manufactured in the United States by Caterpillar Inc. specifically for high-production mining and heavy construction applications worldwide. [1] In production since 1998, the 797 series represents Caterpillar ...

  5. Federal Bridge Gross Weight Formula - Wikipedia

    en.wikipedia.org/wiki/Federal_Bridge_Gross...

    The Federal-Aid Highway Act Amendments of 1974 established the bridge formula as law, along with the gross weight limit of 80,000 pounds (36,000 kg). Current applications of the formula allow for up to 7 axles and 86 feet or more length between axle sets, and a maximum load of 105,500 lbs. [2]

  6. M809 series 5-ton 6×6 truck - Wikipedia

    en.wikipedia.org/wiki/M809_series_5-ton_6×6_truck

    The M809 Series 5-ton 6x6 truck (G908) was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather. In on-road service the load weight was doubled. Built by AM General, they evolved into the M939 Series.

  7. Rolling resistance - Wikipedia

    en.wikipedia.org/wiki/Rolling_resistance

    The thicker and more contoured the tread, the higher the rolling resistance [58] Thus, the "fastest" bicycle tires have very little tread and heavy duty trucks get the best fuel economy as the tire tread wears out. Diameter effects seem to be negligible, provided the pavement is hard and the range of diameters is limited. See dependence on ...