I understand how sizing on road/cross/gravel bikes works, but when it comes to mountain bikes of any era, I do not. It seems like the larger frames tend to be smaller than larger frames for other types of bikes based on what I can find for sale. It's relatively easy to find old 58-62cm road/cross frames, but I don't feel like it's at all easy to find old 24in mountain frames, plus it seems from looking at BikePedia that few frames went beyond about 21 or 22 inches, so I really feel like I'm missing some important piece of information here. Did no tall guys buy mountain bikes in the 1990s? Please help me understand this. Also, if it helps I am almost 6-1.