TANDEM
Tandem sometimes incorrectly refers to a set of two tires on a tractor-trailer.
However, these are more commonly known as double wheels, dual tires or “dualies”. They are used for safety (redundancy) so if one tire blows the others will continue to hold up until the tire is repaired. The correct definition of tandem is a set of two axles, with one axle immediately following the other. By distributing the load over two axles, each axle bears less weight. Because there are laws limiting the amount of weight than can be carried on each axle, distributing the weight over more axles allows a greater total amount of weight to be carried.
Now you know! - Truckie
More jargons to come.
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