I am very new to bike mechanics. Please forgive my ignorance. For the last few years, I've been riding a mountain bike as a road bike. I realized that I would be better off with a road bike, but I don't have the money to buy one. Recently, I got a flat tire on my bike, and i got to thinking. Can I replace my mountain bike tires with road tires? From what I've researched so far, I think it can be done. But how? What should I look for? Can I just buy new tires and tubes and keep the same wheels? Again, I have little money to work with. If that can be done, I'm sure there are measurements that I need to be aware of. Any help would be greatly appreciated. Thanks.