Originally Posted by
JohnDThompson
The reason the 60TSI (60°) shells are relatively rare is that they were only used on 60cm and larger frames, which comprised a relatively small fraction of total production.
Well that makes my Ruby even more of a mystery bike. It's definitely not a 60cm frame:
She measures 22.5" center-to-center, which is 56cm. But her serial number (10910) corresponds to a '82 412 24" (60cm). But this bike has a number of oddities. It's 022 all over, and with an investment cast fork crown. The 412 listing indicates hi-ten fork/stays. It has seat-stay rack braze-ons, which the 412 shouldn't have. Under-the-BB shift cable routing, '83-style. Not a catalog-listed colorway. And the panel letters are separate decals over the panel.