Sounds like they conveniently didn't include the fork blades in the weight. Kinda like the old rim weights "without ferrules."
Nice marketing ploy!
From: INTERNET:LouDeeter@aol.com, INTERNET:LouDeeter@aol.com To: , INTERNET:email@example.com , INTERNET:firstname.lastname@example.org
Date: 10/18/00 3:53 PM
RE: Re: [Classicrendezvous] SLX tubeset wt
The brochure from Columbus says the weight is for 8 tubes for a 54cm center to center frame. My Used Bike Buyers Guide lists the tubeset at the 1700 or so grams that you mentioned, but I don't have that source readily in front of me.