Mongoose Ledge 2.1 26" $20

I'm looking to sell my blue Mongoose Ledge 2.1 mountain bike (26"). It is just under two years old, and works great for biking around campus.

In the interest of full disclosure, there are a few things that may need some tinkering. It is a 21 speed bike, but the left handed gear (1-3) can't shift from 2 to 3. The right handed gears (1-7) work fine. The front brake works great, but the back one works just ok. Both of these things should be pretty easy to fix, but I'm not great with bikes. Lastly, the back wheel treads have worn down over time.

I'm asking for only $20 since it is not in the best condition, but it will do the job if you are just looking for a cheap bike to get to class/work on campus.