Mountain bikes have wide bumpy tires which allow them to be ridden in loose dirt and over obstacles. These bikes have flat handlebars and rugged frames and components. Mountain bikes often have suspension to help any cyclist navigate rocky mountain trails. Many people ride mountain bikes on roads as well as trails. This does the bike no harm. It could be likened to one driving an SUV on the highway: the vehicle will operate fine–it is simply not the most efficient choice. While mountain-style bikes come in all price ranges, the lower end recreational versions are not suited for aggressive mountain biking but work great for trips on smooth dirt paths.