Joined: Oct 2020
Posts: 1,533
Likes: 1,207
From: Phoenix, AZ
Bikes: 1964(?) Frejus Tour de France, 1967(?) Dawes Double Blue, 1979 Trek 710, 1982 Claud Butler Dalesman, 1983 Schwinn Paramount Elite, 1984 Miyata 1000, 2014 Brompton, maybe a couple more
I believe a 4.5 bolt was standard - my 1982 has one. Perhaps it was to keep thieves from stealing the saddle?