Zedillo, Ernesto -He's the president of Mexico. He owns a custom-made Moots titanium bike. When he wants to ride, 30 guards with machine guns clear the trails and give him solitude and singletrack. The big rumor? He's built a private trail around Los Pinos, the Mexican White House.

Zen -Something folks used to talk about a lot. It's an overused term. Everything has Zen. A donut has Zen. Enough with it, this damn article, and all the philosophizing. It's a waste of time. Now go ride.

Zoltron -space age science fiction robo-dub 2000.

Zone - a state of mind experienced while riding. You don't think, you just do. A truly mystical experience that can't be fully explained, but when you get there you'll know it and strive to reach it again.

Zone out - a state of mind where you think you've reached The Zone, but you really just stopped paying attention to what you're doing. Usually used as an excuse for a particularly embarrassing biff.

Zonk - same as bonk.