At 03:00 PM 08/12/2007 -0700, Doug Van Cleve wrote:
>Does the presence of a right dropout with the threaded holes for the
>Porta Catena device narrow down the range of when a frame was most
>likely made?
All depends how large a stock of dropouts the builder kept on hand and how stock was rotated. The right dropout on my '82 Nishiki Ultimate is threaded. According to the timeline, this feature appeared in 1978, but I don't know how long it lasted.
John Betmanis
Woodstock, Ontario
Canada