The topmost small toothed wheel on the rear derailleur. It's responsible for moving the chain during shifting. The bottom pulley is called the "tension pulley." It creates tension on the chain to keep it taut during shifting.

The motorized "circus" that accompanies most major professional stage races and even some amateur events, the caravan is composed of officials' vehicles, motorcycle police, team cars, medical vans and photographers hanging precariously off the back of even more motorcycles.

Also called a "rotor," this is a component found on the front end of many BMX bikes and some freestyle mountain bikes that prevents the rear brake cable from tangling so that you can do easy bar spins and tailwhips (spinning the bars or bike 360 degrees). It splits the brake cable into two segments, which are joined at a rotor installed a [..]

Slang for many cyclists' favorite post-ride "energy bar," the burrito.

(Say: ill - oom - in - nite) - A brand name for a highly reflective fabric used in high-tech cycling clothing.

Also called "glue", this is the adhesive that's applied to rims to mount sew-up (also called "tubular") tires.

Also called "shimmy," this is a dangerous side-to-side front-end oscillation while riding caused by a damaged or in-need-of-repair bicycle, or road/trail conditions. It starts off slowly and gets worse and can easily lead to losing control and crashing. To stop a speed wobble, clamp your knees against the top tube and slow down. If it hap [..]

Shimano's name for its road-bike shifting brake levers. It stands for Shimano Total Integration.

The American Bicycle Association, the world's largest sanctioning BMX organization.

A trick where the rider goes straight up the ramp and while they are still facing forward they tap the back tire to the coping/obstacle, then drop back down the ramp riding backwards or fakie. The rider's body faces the same direction through the whole trick.