Look at it like this
The CIRCUMFERENCE of a wheel is Diameter (D) x Pi (3.14)
Or roughly D x 3
So, a 4" wheel = 4 x 3 = 12.
One revolution of that wheel will travel 12" along the ground
A 6" wheel = 6 x 3 = 18
One revolution of that wheel will travel 18" along the ground
An 8" wheel = 8 x 3 = 24
One revolution of that wheel will travel 24" along the ground
If these wheels are mounted on your buffer, which does 1 revolution, a point on the circumference of will travel different distances, depending on the diameter of the wheel.
If the motor revolves the wheel 3500 RPM - then the distance of that point on each wheel will travel further as the wheels get bigger.
So, seeing as RPM is a time element, greater distances will be traveled in the given time of one minute.
Clear as mud eh??
