Trials Bikes 
  So, Trials bikes are a lot like Dirt bikes. But they have some changes like: Dirt bikes have a seat and Trials bikes don't. I know, sounds weird, but why put the extra weight when you are trying to jump over things and balance on top of stuff? You just don't need it when you're standing up most of the time!
  When you ride a Dirt bike you are riding on dirt. Not giant rocks and waterfalls! It's just not as hard as Trials!
  In Trials you are trying to get through a course without putting your feet on the ground. So it needs great balance and upper body strength!
  The course can be in a forest or just plain dirt with obstacles.
  What kind of bike do you want?
Well, you want one that's good for you. There are lot of things to make sure you have before you purchase a bike. You want the right engine size. The bigger engines have more power and more speed abilities!
  That doesn't mean okay we need lots of speed so let's get a 2000 cc engine! That's a really dumb mistake! First of all in trials you don't need a lot of speed! You are slowly making it through a course. If you go 45 MPH toward a rock and you're planning to jump it with a 2000 cc bike you're most likely going to run into it face first!! Yeah, so you need one that's right for you!

Coco
Here is my drawing of a trials bike!