They were around at least as early as 1973, probably earlier. I found them very useful, as race wheels, but I was easy on equipment and weighed 130 lbs. at the time. After I won a few races, I raced on 330 to 350gr. rims, more was at stake at that point, finishing was more important than ultimate light weight.
Today at 175 lbs, I would consider them velodrome rims or front only on the road.
Give me heavier rims and 32 spokes, happiness.
John Jorgensen
Palos Verdes Ca