Wikipedia says:
Cyclo-cross (sometimes Cyclocross, CX, cyclo-X or 'cross) is a form of bicycle racing. Races take place typically in the autumn and winter, and consists of many laps of a short (2.5–3.5 km or 1.5–2 mile) course featuring pavement,wooded trails, grass, steep hills and obstacles requiring the rider to quickly dismount, carry the bike whilst navigating the obstruction and remount in one graceful motion.
That's my new Specialized Tricross cyclocross bike. I'm excited to go play in the cyclocross races this fall. I rode my new bike into work today and it was great to have a bike that can run over so much more stuff than my road bike. It was more like riding a bike through the neighborhood as a kid: riding through grass, off curbs, through gravel. Good fun.
