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1- or 2-digit/letter combination: Speed rating; see table below. Additional marks: see subheading below. As an example, if a tire size has two sets of numbers (6-12, 5.00-15, 11.2-24), then the first number (5.00-15) is the approximate width in inches, and the second number (5.00-15) is the rim diameter in inches.
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.
A winch weighed 714 lb (324 kg) and added 15 + 1 ⁄ 2 in (39 cm) inches to the length of the truck. [8] [9] The M39 series had both single- and dual-rear-tire models; very few single-rear-tire trucks were built. Most models had 11.00×20s with dual rear tires; tractor wreckers had larger 12.00×20s.
Most models had 11.00x20 size tires with dual rear tires. Some M813s had 14.00x20 with single rear tires, the M812 and M821 bridge trucks had 14.00x20 with dual rear tires. The M819 wrecker tractor had 12.00x20 with dual rear tires. All tires were bi-directional military pattern. [8] Brakes were air over hydraulic with drum brakes on all wheels ...
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]
M425s had 9.00x20 size tires, while M426s had larger 11.00x20s with stronger springs and a slightly longer 10 metres (32.81 ft) wheelbase. All had dual rear tires. Except for the difference in the size of the tires, and some minor details, all types are mechanically identical. All models were a cab over engine design with a military style open cab.