The Spike Factor is essentially the number of different physical locations a unit can be moved to. It is really only relevant for turntables and treadmills, or other machines that can have continuous motion in a given direction.
For example, a turntable only has 360 degrees of travel before it is back to it's original position. A treadmill that has a matching paint pattern every 2' could use a 24" factor so that it would always match the paint.
Spike Offset is the location away from the origin.