(Eli5) Why do Buses & Trucks use 2 skinny wheels put together on each side of the axle? Instead of just using one fat wheel?

Question

(Eli5) Why do Buses & Trucks use 2 skinny wheels put together on each side of the axle? Instead of just using one fat wheel?

In: Engineering

Answer 1

You want to be able to turn. Inside and outside wheels travel at different speeds in corners.