Maxtog, I'm not sure we're on the same page when we're measuring.
In an earlier post you said;
As I warn in my first postings, the proper location to measure actual drop is from the axle center of the rear wheel. If you measure the back of the frame, there will appear to be more drop, or forward of the axle, it will appear be less drop. So who even knows what claimed numbers mean until you put it on and measure it yourself (just make sure to do it on level ground and make sure to bounce in the bike a few times first).
It sounds like your measuring from the axle to the frame, with weight on the rear tire?
If yes, that is not how I am doing it and does not give me the information I'm looking for.
To find the actual (geometric) change you get from changing the links, you have to measure from the axle to the frame {directly above the axle}, with the bike on the center stand, the rear tire off the ground, and the rear suspension fully extended..
PS: I am "not" saying your measurement is not good.
Yours actually tells you how much the seat height changed..
That is good as it is real world. But your methods includes spring sag.
Spring sag is different on every bike, so the spring sag has to be out of the measurement to get an actual number.
I'm looking for an actual number to use in a calculation.
Ride safe, Ted