[CR]Aha! I found the reference to 'Quad Butted Tubing'...

(Example: Events:Cirque du Cyclisme:2004)

From: "jimhultman" <jimhultman@e-mail.msn.com>
To: <classicrendezvous@bikelist.org>
Date: Fri, 27 Jul 2001 20:53:49 -0700
Organization: Microsoft Corporation
Subject: [CR]Aha! I found the reference to 'Quad Butted Tubing'...

To those interested in old Fuji's...This comes from Santana, not Fuji...I hope you'll accept it as possible Fuji built their VaLites this way....(I don't want to cut my Club Fuji apart to prove it though).

"How about a "quad butted" tube? While double-butted and triple-butted tubes both have two internally-tapered transitions (one at each end of the tube), a quad-butted tube has four internal tapers---one at each end plus a pair in the middle to create a mid-tube reinforcement (i.e. 8/5/8/5/8---read each slash mark as a transitioning taper). Easton has produced double-length quad-butted top tubes for Santana since 1993. The thick center section exists where the front seat-tube passes through the one-piece top tube. Prior to this, tandems with a double-length top tube used a plain gauge tube---a popular time and money saving (easy-to-jig) compromise that LOOKS high-tech and adds a full half pound to the weight of a frame. Easton also draws quad-butted seatstays for Santana; thicker at both ends and the where the cantilever boss is attached".

Jim Hultman