Not necessarily. A weakened spring (which is what the Z suffers from) means that the spring rate is lowered as each coil sits slightly closer to the next. So the static sag reduces at a directly proportional rate to that at which the spring rate is reduced (by stress, fatigue and collapsing coil spacing.)

On the Z, most owners find that this manifests itself as having to dial in more and more preload as the bike mileage builds up just to keep static and dynamic sag within the correct range... Until you run out of preload adjustment, and ultimately need a spring or shock change.

__________________