A fully rigid classic mountain bike is one that does not feature a suspension system -- or a specialized system used to insulate both rider and bike from rough trails. While fully rigid classic mountain bikes were once considered the norm, many riders have now turned to full-suspension bikes.

Converting a bike to have coaster brakes requires knowledge about the different parts of a bike and how they work with each other. Installing coaster brakes is a great way to teach beginners how to ride and balance properly. Also called pedal brakes, they stop the bike when the user rotates and pedals backward.