I just moved to the Northwest and am looking into getting a new bike. I haven't bought a bike since I was a kid and don't really know much about them anymore. I'm interested in using it for commuting, road riding and if I can cyclocross style riding as well. So, what I'm wondering is if it is possibe (and makes sense) to get a cyclocross bike, ride it in the fall and winter as is and then in spring and summer put road tires on it and use if for road riding? I don't have the cash to buy a mtn bike, road bike, and cyclocross bike but would like to do some off and some one road riding. Some times one or the other exclusively. Let me know your thoughts.