I think the questions on the list reflect what people are most familiar with. One has to remember this list is made up of 90% (?) American listmembers. If you go looking for 50's and 60's lightweights where I live you'll be looking quite awhile I'm afraid. The bike boom is when so many bikes came to this country but before that what are you going to turn up? Mostly Heavyweight and middleweight Schwinn, Columbia, etc. Folks in Europe have a better chance of turning up actual old road race bikes than I do. That's the situation as I understand it. I'd really like to go to flea markets and turn up old British bikes and parts.
Note: I'm not saying there are no 50's and 60's lightweights in the USA just the numbers are very small. The ones we hear about on the list are almost always track bikes.
Pete Geurds
Douglassville, PA