Join Date: Jun 2001
Location: living in the moment
Bikes: 2005 Litespeed Teramo, 2000 Marinoni Leggero, 2001 Kona Major Jake (with Campy Centaur), 1997 Specialized S-Works M2, 1992 Specialized Rockhopper
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there are two reasons, basically...
the first is safety. the idea is that discs can be a safety hazard in tight groups, and going over the barriers in a crowd.
the second is the uci's understandable attampt to create a definition for a cyclo-cross bike that differs from mountain bikes. the rationale is that, in order for the sport to thrive, it must have a unique, definable bike.
whatever the case, the rule only applies to uci-sanctioned races.