[CR] Why do older frames have only one set of bottle bosses?

(Example: Events:Cirque du Cyclisme:2004)

From: "michael haddad" <haddawad399@hotmail.com>
To: <classicrendezvous@bikelist.org>
Date: Tue, 27 Apr 2010 21:14:07 -0400
Subject: [CR] Why do older frames have only one set of bottle bosses?

I find that on-topic frames (like my 1984 Cinelli, 1983 Pinarello & 1978 Masi) tend to have bottle cage bosses only on the down tube. I know that 2 bottles were needed for most road races (even in the 80's), so why only one set?

The only thing I can think of is that the braze-ons might weaken the seat tube, but then why have them on the down tube?

I have been curious about this and would be interested in hearing a definitive answer or some good theories.

Regards to all,

Michael Haddad

Brooklyn, NY, USA