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Buying a bicycle is exciting and rewarding, but choosing the right bicycle requires some thought. One of the major considerations is whether to get a mountain bike, a racing bike, or a BMX bike. All of these have the parts that you would expect from a bicycle: a frame, pedals, two wheels, a chain-- but mountain bikes and racing bikes have multiple gears while BMX bikes have only one gear. Multiple gears give the rider the ability to increase or decrease the force required to push the pedals. This can be an advantage when you are travelling over a variety of surfaces. Racing bikes and mountain bikes both have multiple gears, but mountain bikes tend to have thicker, more rugged tires that allow the cyclist to travel off of the path more smoothly. Racing bikes may go faster than mountain bikes on streets, but they are pretty much limited to riding on paved roads. Like mountain bikes, BMX bikes are built for off-roading. BMX bikes even have a popular off-road race culture associated with them, but if you plan on riding great distances, you would probably find a mountain bike to be more comfortable. When it's time to make that big purchase, you should weigh these considerations.
Which text structure is being used in this passage?
Compare and Contrast