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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. [7] [8]

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

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

   The M939 series uses 11:00 R20 tires with two tires per side per axle in the rear (rear tandem duals). This allows a heavy load to be carried on improved roads and most US trucks in the past have used them. The M939A1 and M939A2 series instead use oversized 14:00 R20 tires with a single tire on each side per axle, still with a tandem setup.

4. List of truck types - Wikipedia

   en.wikipedia.org/wiki/List_of_truck_types

   Medium trucks are larger than light but smaller than heavy trucks. In the US, they are defined as weighing between 14 001– 26 000 lb (6 351– 11 793 kg). In North America, a medium-duty truck is larger than a heavy-duty pickup truck or full-size van. Some trucks listed as medium also are made in heavy versions. Box truck; Van; Cutaway van ...

5. Truck classification - Wikipedia

   en.wikipedia.org/wiki/Truck_classification

   The now-imprecise ton rating has continued since the post World War II era to compare standard sizes, rather than actual capacities. [25] [26] In 1975, a change in U.S. emission laws required any vehicle under 6000 pounds GVWR to burn unleaded fuel. U.S. pickup truck manufacturers responded with a "heavy half" pickup of over 6000 pounds GVWR. [23]

6. 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/5-ton_6×6_truck

   Most models had 11.00x20 size tires with dual rear tires, bridge trucks and some chassis-cabs had 14.00x20 with dual rear tires. Early M939s used 11.00x20s with dual tires, but M939A1s had 14.00x20s with single rear tires and M939A2s introduced a central tire inflation system. [28] [31] [32] [33]

7. Tire - Wikipedia

   en.wikipedia.org/wiki/Tire

   Off-road tires under transport. Heavy-duty tires for large trucks and buses come in a variety of profiles and carry loads in the range of 4,000 to 5,500 pounds (1,800 to 2,500 kg) on the drive wheel. [25] These are typically mounted in tandem on the drive axle. [34]