Road bike wheels can result in the single biggest improvement to the speed at https://www.tuffcycle.com/road.html
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Road bikes are specially designed bikes manufactured to make it comfortable while traveling at speed on paved roads. These bikes, also known as racing bikes, are light in weight and equipped with multiple derailleur gears. The tires of these bikes are narrow and smooth enough to decrease the rolling resistance. The term road bike wheels also describe any regular bike that runs effectively on paved roads, in contrast to a bike specially built for a particular purpose.