Welcome to Clutch and Chrome's Biker Dictionary.

Ever read or hear something that sounds like biker lingo or rider slang? We've collected the most commonly used definitions, lingo and slang and put it in everyday language.

If there's something you feel we've missed email our Biker Dictionary Editor with the word or phrase and what it means. Make sure to include your name and where you live since we want to give you credit!

Enjoy!

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U - V - W - X - Y - Z

Detonation
A part of the engines combustion process is mistimed or interupted creating an uncontrolled explosion in the combustion chamber. It occurs from improper air and fuel mixture, timing or excessive carbon in the combustion chamber. Also see Pre-Ignition.

Dirtbike
Motorcycles intended for off-road use and aren't legal to ride on public roads.

Discs
The metal rotors used in the braking mechanism.

Displacement
Used to describe the size of an engine, in cubic centimeters (cc) or cubic inches (ci)
or
The volume through which the piston travels during a single stroke of an engine, sometimes used for the total volume displaced by all engine pistons and measured in cubic centimeters (ccm).

Donor Cycle
Nickname for any motorcycle ridden fast or recklessly

DOT
Department of Transportation

Drag Bars
Low, flat and straight handlebars.

Drag Pipes
Short exhaust pipes that run low along the frame.

Dresser
A motorcycle set up for long distance touring.

Dual Sport
A dual purpose motorcycle, made for both on and off the road travel.

Duals
Two separate Exhaust pipes leading into the front and rear cylinder.