Middle aged it... I resemble that comment. As a guy who owns a 1980 912 and a straight guage falcon I feel compelled to give you my totally uninformed comments. First I was kind of puzzled by how short the top tube is on the 912, but it is comfortable. Of course I often run porteur bars so everything is comfortable to me. The thing that really surprised me about those two bikes is that I preferred the falcon. Both climbed well, both took pretty well to 650b when I tried that but with 700c the falcon was the clear winner for it's greater room for tires. The Miyata always built up a touch lighter and that short top tube was nice on my arthritic neck. Now back to your original question.... I have no idea...