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?

Question

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

Answer 1

There are technical and commercial aspects of this

1. Technical

— better weight distribution ( two tires lead to better distribution of load on the surface, limiting the extent of pressure exerted on tire)

— higher safety factor (in case of air pressure loss, the other tires can still support the load, providing higher reliability),

— Stability (provides better grip and stability when turning, on when on uneven surface, avoids tipping over)

2. Commercial

— a single wider tire will lead to higher cost in terms of production, installation, maintenance, and repair

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Thanks

AbhyuK