mooredan, static sag is just that. The weight has to be in place to accurately measure your static. It will also have to be in place when you do the rider sag.

 

Duh (to myself), what was I thinking? The additional weight of the box won't affect the zero sag at all. I could put a 50lb sack of flour back there and it wouldn't affect this measurement at all.

I'm assuming that when you say "static" sag, that's the same as when I say "bike" sag. I'm using the nomenclature from the planetklx web site. http://planetklx.com/techtips/sag.shtml

So my question then boils down to whether I include the box on the third measurement, bike sag (where the bike is sagging under its own weight, without a rider and gear). I guess it's the "without gear" part of this that I'm having trouble with. Couldn't one argue that the box is part of the rider's gear? ...so this measurement should be done without it?

...or am I thinking about this too much? ...and the weight of the box is negligible? I guess there's one way to find out: perform the measurements with and without the box during the bike sag measurements.

 

Include the box.

 

hahaha, yes, keep it simple and sweet. Include the box!