Actually ... NO!!!

On paper, it's all about radius. On the road, it's all about circumference. I know that circumference is directly proportional to radius (high school was a loooooong time ago, but I remember the simple stuff). But, when the rubber meets the road, the tire can no longer be treated as a circle - it's flat where the contact is made. Believe it or not, the radius decreases (mushes down) but the circumference remains constant. A worn tire has less circumference (distance traveled per revolution of the tire) than a new one. Suspension has no bearing on the equation.