Why are two slimmer wheels paired on each side of the axle in buses and container carrying vehicles, instead of a single large broader wheel?
In: Engineering
There are “super singles”. The problem is that they are more expensive than a pair of regular duallys. Also, tires are strongest when the section width (widest part of the tire) is just wider than the sidewall height. This gives a more round shape to the internal structure and is the strongest design. Having a single wide tire either requires a wider shape or wheels too small to fit brakes inside. There is also a logistical benefit to only having a single spare since the fronts are usually the same as one of the rears.
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