I want to get into cycling but I don't think I want to go all out for a road bike. I'm planning on using the bike mainly for riding to school and long rides and possibly some trails on the weekends. Cyclocross bikes seem very interesting but I was wondering what was the difference between cx and hybrids? Which is lighter, faster etc. I've ridden my friends mountain bike a few times but I really want to go faster and I don't think I'm going to be on enough mountainous trails to get one. If I got a cx bike, would switching to road bike tires make it a "road bike" or are there other differences? Also, would this be a good bike for the occassional (not that competitive) triathlon? Thanks for the help, as you can tell I'm very new to all this.