You would be surprised as to how many people purchase cheap mountain bikes from a superstore like Walmart, not even do so much as having an inspection done by a professional bike servicer, and then take their bike out that very first day. Of course, it is understandable why someone would rather purchase their mountain bike at a place like Walmart instead of a dedicated bike shop. Bikes from a superstore can be found for as little as one hundred and thirty dollars. On the contrary, any respectable adult mountain bike is going to cost you at least $750 and very likely over one thousand dollars. So there is certainly something to be gained by going the cheap route when purchasing your mountain bike. But at the very least, even if it costs you a few pennies, get your bike inspected and tuned by a professional before you hit the road with it.