Originally Posted by
AdventureManCO
Wait, which is which? Video says 'Type A' but shows the one on top (maybe that is just an unintentionally misleading still frame), whereas you mention the top one (red frame) being type B. But thank you, didn't even know different types existed. So the goofy, non-square one is type B?
Yes. Top one is the Shimano Type B which was I guess, done for certain early 80’s bikes using specific Shimano group sets.
The bottom frame is the more common Type A.