1. Motorcross bikes must be light and tough.
 
 

2. Always wear a helmet.
 
 

3. Don't ride on private property.
 
 

4. The enduro racers test their endurance.
 
 

5. The enduro racers travel 50 to 150 miles.
 
 

6. "Whoops"-is what racers call stutter bumps.
 
 

7. Supercross racers take place in side NFL
stadiums and domes.
 
 

8. All tracks are man made and they are at least 1-2 miles long.
 
 

9. An established star can make up to 1 million
dollars a year.

10. Dirt bike racing was originated in 1971