Maybe you don't have enough time to bicycle, then.

Every area is different WRT bicycle theft, but in general I wouldn't be too worried with someone stealing the front wheel off a 28-year-old bike -- assuming it's the original wheel. I just got a new bike with nice wheels, so I'm double-locking with a u-lock through the frame and a cable for the front wheel. That seems to be plenty, and it takes less time than it takes a driver to park their car. What I observe in Boston is that most people don't lock the front wheel, and almost nobody takes the saddle with them -- and the only time I've seen bikes with missing wheels is when they're abandoned junkers. I don't routinely park my bike on college campuses, though, although Boston is lousy with college students no matter where you go. The thing about college kids is, there's almost always someone who's got a nicer bike that their parents bought them and who's too busy to spend less than a minute locking it up, so they provide a nice amount of "low-hanging fruit" for thieves. Remember, I don't have to outrun the bear, I just have to outrun you...