Measurements for those of you considering one.
Stand over height with 26" knobbies = 30 inches
seat tube center to top = 20"
top tube center to center = 23"
wheel base = 42"
I don't know if these ever came in different frame sizes. All the bikes & photos I've seen look the same. Fuji sold their mtbs in several sizes but they might have agreed with Marlboro that "1 size fits all" like all box marts do now.
My road bikes are mostly 54 cm ct x 54.5 cc. That's a 21" seat tube with a 21" top tube. As frames get taller, they do get longer but not at same rate. A 60 cm frame would not have a 60cm top tube. This fuji is 2 inches longer than normal imo. Back in the 1970s many manufacturers would use overly long top tubes in shorter frames to prevent the front wheel from hitting your feet.
40" wheel base is rather average.
Crit or track racing bikes can be as short as 38"
Many vintage long distance bikes were about 42"
Mountain bikes tend to be longer, my 19" 2002 specialized rockhopper FS a1 with shock fork is 43"
I realized the rattling on mine is where the seat post fits loosely in the top tube seat lug. The seat tube seat lug hosts the clamp. The ritchey breakaway bikes use 2 seat post bolts, one on each seat lug to prevent any rattling.