They said a person rolled a big wheel if he was important and had influence.

VOA: special.2009.11.29

As in many machines, a big wheel makes the little wheels turn.

VOA: special.2009.11.29

Big wheel is another way to describe an important person.

VOA: special.2009.11.29

Big wheel became a popular expression after World War Two.

VOA: special.2009.11.29