Originally Posted by
clubman
I dunno. I've got Raleigh pedals dating from the 50's to the 70's....all 9/16' X 20. Way back they may have had 1/2" as were many early 20th century models.
Usually the 1/2" stuff is reserved for Ashtabula cranks, like you see on older American stuff. My 1935 roadster uses 9/16".