Joined: Apr 2006
Posts: 4,047
Likes: 937
From: Washington County, Vermont, USA
Bikes: 1966 Dawes Double Blue, 1976 Raleigh Gran Sport, 1975 Raleigh Sprite 27, 1980 Univega Viva Sport, 1971 Gitane Tour de France, 1984 Lotus Classique, 1976 Motobecane Grand Record
Wow! Cool information, I never knew about that. I wonder how many of those 490d rings are sitting around in boxes, mistaken for standard 49d rings?
Is one of the additional drillings spaced at 122? The others appear not to be countersunk. It would be convenient to be able to use the same outer ring for either BCD.
I will admit that my first thought on seeing this was "Hey, some enterprising triplizer-monger ought to revive this one." Then I came to my senses.