Does wheel size affect speed on remote control cars?

A smaller wheel will be easier to turn, but will travel less for each revolution.

A bigger wheel will be harder to turn, but will go farther with each revolution.

Sticking a bigger wheel on a car that hasn't got the power to get it turning properly will make it slower - not faster.

Sticking a smaller wheel on a car that's already has its engine spinning like crazy won't make it faster either.