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Trials
A form of bicycle acrobatics, in which the object is to navigate a course that is as close to un-rideable as possible, without putting a foot down (known as "dabbing.")
Trials are sometimes done on more-or-less standard mountain bikes, but more often with purpose-built trials bikes.
A trials bike is a one speed, geared very low, with a tiny chainwheel both for low gearing and improved clearance. Tires are usually fat 20" or 24" size, with aggressive tread. Frames are small, equipped with a very low saddle. Trials riders never actually sit on the saddle, but a saddle is required as a safety measure.
The major technique involves locking the wheels up with the brakes, and bouncing the bike up and down in the manner of a pogo stick. In this way it is possible to climb stairs sideways, etc.
