yes, dirt bikes are motorized
Brand wise, it is KTM. The make a wide varity of dirt bikes in both two and four strokes. They have everything from kid's bikes to enduro bikes to MX bike. They are by far the best.
heres the best one. Yamaha
I personally think the dirt bikes with the wider wheels are the best
dirt bikes
Everybody that races dirt bikes "started" racing dirt bikes at some point.
dirt bikes in the past had less gears and power then dirt bikes have today
any thing fox racing
The two main types of dirt bikes are motocross and trail bikes. Yamaha, Kawasaki, and Honda all make these types of dirt bikes.
no dirt bikes arn't illegal
no there not dirt bike is better
dirt-biking is for dirt-bikes it can be either stunt or mud riding