Join Date: Feb 2007
Location: Central CA
Bikes: Fuji SST, Cotic Roadrat, Bianchi SASS, a bunch of others
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That frame is going to cause you all kinds of headaches trying to turn it into a 'cross bike. You'll want studs for cantilever brakes (for braking power, and for clearance to get tires through), as well as cable stops, and that bike doesn't have them. Also, I don't know what kind of clearance your frame has for knobby tires, and different manufacturers have different tread patterns/profiles- you'll need to experiment (I suggest avoiding 'mud' tires). You can just deflate knobby tires to squeeze them between road caliper pads, but your braking is going to suffer, and narrow tires will perform poorly on wet courses.
In short, a road frame and a cyclocross frame look very similar but are totally different animals; ditch that heavy clunker of fixed-gear frame and start with a cyclocross-specific or mountain bike frame, or if you want something complete and cheap, a fantomcross uno from bikesdirect.
Also, I know this sounds like a fun project, but I would strongly consider a geared bike. A good cyclocross course is an exercise in a variety of gears; choosing a fg/ss bike for daily use is a balance of pros a cons- a ss/fg bike for a cx race is simply a handicap that I wouldn't suggest to a beginner. Consider a 1x8/9/10 setup if you want something more simple.
Last, they probably would not allow bullhorns in a sanctioned CX race, but you're probably alright in the lower classes with flat bars. I suggest drops.