Title says it all. Does anyone know if a 05Trek 1500 converted to a cyclocross? Thinking about buying, building or converting a bike for the fun of it. Hate to sink much money into it because I really don't think I would use it much. But I have that 1500 that I hardly use. I guess the biggest problem would be tire clearance. Anyone know if there is enough clearance to put some knobby tires on it?