What's the difference between a dirtbike and a pit bike?

is a pit bike smaller than a dirtbike or something? just wondering,

A pitbike is a mini dirt bike. These days there are pit bike races and they call them fast 50's although they can have engines up to 125cc. But a 125cc pitbike wont go as hard as a 125cc motorcross bike, as is a completely different category.

Pit bike is made for going slow, on streets and not for being abused. Dirtbike is ready for anything.
There is no true definition of what a pit bike truly is, but by most standards it is a bike with a 10" or 12" rear wheel and a 4 stroke air-cooled engine. For a good representation of what most consider a "pit bike" take a look at this link.
http://pitsterpro.com/home.php

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Quad Bike Pocket Bike Mini Bike Chopper Bike Pit Bike Dirt Bike Sport Bike Street Bike Exercise Bike

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