By definition, a "Pit Bike" is a small bike, usually ridden around in the pit area at races, etc. You'll usually find the 50cc variety bored out up to 192cc- small bikes that have been modified with aftermarket parts.
They grew from being a mode of transportation in the pits to being fully modified little race bikes that are used in competitions specifically designed for that type of bike.
Pit bikes typically don'y get much bigger than 150cc. No standard definition of what constitutes a pit-bike by any major governing body exits, but the normal requirement is a 10"-14" front wheel, and a 10"-12" rear.
When you are up in the 250cc range you are looking at a full fledged motorcycle. Either a motocross or trail bike, 250cc isn't considered a pit bike.
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