Generally there's a few steps in frame "quality" (as viewed by the easily led public) over the line of models a big company offers. So the least expensive has the thickest walls of tubing and maybe the lower cost alloy make up. At some point higher in the line up the wall thickness lessens and/or alloy becomes one with a higher strength to weight ratio. Perhaps a third step happens too.

It's not too hard to read the spec sheet and note the changing descriptions of the frame to figure this out. Usually bike companies like to give their "better" frames a cool name and these change with the grade changes.

Is this noMadic? Andy.