Changed the wheel size? Your speedometer will lie to you

What happens when you change the wheel and tire of a car for two smaller ones, reducing the overall diameter of the wheel plus tire and still leaving the car lower?

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For reasoning purposes, imagine that you changed the original wheels and tires of your car for a wheel with a scooter tire. Let’s suppose that when your car’s wheel makes a full turn, the car has gone 2.5 m, for example, but if it has a scooter wheel, it will only go 1 m.

Yes, but the speedometer and odometer on the dashboard don’t know that you changed the wheel and will register speed and space traveled (mileage) completely wrong. Do you understand why the speedometer and odometer start to indicate the wrong speed and mileage when the wheels are increased or decreased?