Saddle Tree sizes in CM

Can I get some help with understanding tree sizes in centimeters? I am only really familiar with the traditional narrow, medium wide verbiage. I have a Stubben that I am going to be selling and need to look as I believe they are measured in centimeters also. Looking at getting a new one and need a narrow of some sort and want to compare my Stubben (unknown tree CM size) to others.
Thanks!

Here’s Stubben’s explanation of their system: https://stubbennorthamerica.com/tidbit-tree-width/

I don’t believe you can compare tree widths across brands very accurately. You can try measuring your saddle in cm, and see if you can get similar measurements on any saddles you are considering. There is much more to saddle fit than the width, however, so this is just the first way to winnow down the selections.

If your current Stubben still has the billet guard, the tree width should be stamped on it just below the serial number.

Agreed that it’s difficult to compare CM sizes between brands, just as it’s difficult to compare N/M/W between brands - there’s no standardization between brands.

Thanks for the Stubben document. Yes, I completely agree that it is hard to compare different brands of saddles just as it is with shoes for people. Just helps to gives me an idea if I should be looking at it or not. Working on getting a saddle fitter out again to fit me and my horse. Thanks