i'd guess it's a 1" steertube for weight savings.
i think cancellara was riding FMB tires. kinda wanna get some of the 25mm PR tubs for a wheelset for the davidson...but they big monies.
http://www.fm-boyaux.fr/
Jeff Piwonka
Austin, Texas USA.
> From: FujiFish1@aol.com <FujiFish1@aol.com>
\r?\n> Subject: Re: [CR] KOF Bike Tech at Paris-Roubaix?
\r?\n> To: classicrendezvous@bikelist.org
\r?\n> Date: Tuesday, April 13, 2010, 9:09 AM
\r?\n> During last weekend's Paris-Roubaix,
\r?\n> it was noted by either Paul or Phil,
\r?\n> the VS Network announcers, that race winner Fabian
\r?\n> Cancellara was riding on
\r?\n> special 27mm tubulars that he arranged to be "hand made by
\r?\n> an Italian
\r?\n> artisan". They looked perfectly old skool, with black
\r?\n> tread and tan sidewalls.
\r?\n> It was a proud moment for us vintage enthusiasts,
\r?\n> especially since he won
\r?\n> on them.
\r?\n>
\r?\n> Ciao,
\r?\n> Mark Agree
\r?\n> Southfield MI USA
\r?\n> ~ ~ ~
\r?\n>
\r?\n>
\r?\n> Date: Tue, 13 Apr 2010 01:02:37 -0400
\r?\n> From: Matthew 'Devotion' Bowne <devotion_finesse@hotmail.com>
\r?\n> Subject: [CR] KOF Bike Tech at Paris-Roubaix?
\r?\n>
\r?\n>
\r?\n> I am always thrilled to see certain old-school bike
\r?\n> tech make it's way
\r?\n> into the contemporary European pro peloton...but this
\r?\n> is one I didn't expect
\r?\n> to see...
\r?\n> Because of it's notoriously rough roads and brutal
\r?\n> riding conditions, the
\r?\n> "Queen of the Classics", Paris-Roubaix has often been
\r?\n> a proving ground for
\r?\n> new technologies.? (Remember the Rock Shox in the
\r?\n> early 90's? The full
\r?\n> suspension Bianchis, etc.?)? Well not only has
\r?\n> Paris-Roubaix brought on the
\r?\n> development of new bike tech, but recent years have
\r?\n> also seen the return of
\r?\n> some old ones.? Over the past few years, riders have
\r?\n> been known to outfit
\r?\n> their bikes with steel forks, wide skin-walled
\r?\n> classic tubies, vintage
\r?\n> cantilever brakes and other part mods that seem odd
\r?\n> in the current peloton but
\r?\n> certainly "on topic" to groups like ours.? Heck, even
\r?\n> Lance has been known to
\r?\n> run early Dura-Ace Ax calipers on a TT bike in recent
\r?\n> history...
\r?\n> Anyhow, below is one that I thought might be of interest to
\r?\n> The List:
\r?\n>
\r?\n> http://www.cyclingnews.com/
\r?\n> ning-rig/115224
\r?\n>
\r?\n> That's right, a rider on Team Milram rode a lugged
\r?\n> steel fork with a 1"
\r?\n> steerer tube!? KOF indeed! Have a look at the pic and
\r?\n> note the "reducer" it
\r?\n> needed to be coupled with to work with the over-sized
\r?\n> headtube on the
\r?\n> presumably carbon-fiber frame.?? I can't help but
\r?\n> wonder how this came to be...A
\r?\n> team mechanic's late-night "McGuyver" move?? So why
\r?\n> THIS fork? Are there
\r?\n> not still master-builders who would jump at the
\r?\n> chance to braze a (1 1/8")
\r?\n> lugged steel fork for a pro riding in Paris-Roubaix??
\r?\n>
\r?\n>
\r?\n> Anybody have any thoughts or insight as to how this
\r?\n> came to be?? Any other
\r?\n> examples of KOF builds or tech used by modern
\r?\n> pros??
\r?\n>
\r?\n> Matthew Bowne
\r?\n> Surprised and Happy in
\r?\n> Brooklyn, New York