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For trailers, the purpose is to bear heavier loads than a single axle provides. In heavy trucks, tandem refers to two closely spaced axles. Legally defined by the distance between the axles (up to 2.5 m (8 ft 2 + 3 ⁄ 8 in) in the European Union, 40–96 inches (1.02–2.44 m) in the United States), mechanically there are many configurations ...
A tandem axle is a group of two or more axles situated close together. Truck designs use such a configuration to provide a greater weight capacity than a single axle. Semi-trailers usually have a tandem axle at the rear. Axles are typically made from SAE grade 41xx steel or SAE grade 10xx steel.
Increased axle lengths beyond these do not increase maximum legal weight. [11] 6 __ Exception to the formula: when the four axles under consideration are two tandem axles spaced at least 36 feet (10.97 m) apart, a gross weight of 68,000 pounds (30,844 kg) is allowed. [11] __ Upper blank areas represent unrealistic configurations. [4]
In Europe, usually only the driven tractor axle has dual wheels, while single wheels are used for every other axle on the tractor and the trailer. The most common combination used in Europe is a semi tractor with two axles and a cargo trailer with three axles, one of which is sometimes a lift axle, giving 5 axles and 12 wheels in total. This ...
A B-double (single axle steering, tandem drive, and two tri-axle groups) would have an operational weight of 62.5 t (61.5 long tons; 68.9 short tons). A double road train (single axle steering, tandem drive, tri-axle, tandem, tri-axle) would have an operational weight of 79 t (78 long tons; 87 short tons).
There are also two axle tractors, single axle trailers, and occasionally combinations with extra lift axles. In some applications a semi can pull additional full trailers (doubles and triples) with the use of a single axle or tandem axle converter dolly. [10] The use of the term "semi" in the name comes from the semi-trailer, a vehicle whose ...
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