Is this a good bike?

I am getting a new bike with my own money i saved up. im getting it from walmart. under the specifications on walmart.com it says it has knobby tires, dual suspention BMX, liener pull brakes, and 21 speed grip shift gear shifters. what does all this mean. i like to be a little rough with my bike and go off bumps,... show more I am getting a new bike with my own money i saved up. im getting it from walmart. under the specifications on walmart.com it says it has knobby tires, dual suspention BMX, liener pull brakes, and 21 speed grip shift gear shifters. what does all this mean. i like to be a little rough with my bike and go off bumps, is this a good bike for me then? here is the bike i want: http://www.walmart.com/catalog/product.do?product_id=2513008

under everything it says specifications, thats where everything is.

P.S. i am a girl, but i want to buy a boys bike because i like them better.
Update: im riding a 24 now and my knees almost hit the handle bars
11 answers 11