Some Basic Physics
speed is a result of power output minus resistance.
Having a light bike with skinny tires is one way, albeit the most costly, that people reduce resistance and increase their speed. But the amount of resistance you can reduce using this method is small, and futile, compared to simply deciding to build a better engine while increasing comfort and athletic positioning.
A couple reflections
Assuming the same power output from my legs, riding a mountain bike in an aerodynamic position will result in going as fast or faster than if I were riding the most expensive road racing bike in the world in a half - upright (45degree) riding position.
Having a bicycle that fits you reasonably well and has a clean, working drive train with plenty of gears (chain, cogs, cables) is all you need to build your motor. Your motor consists of leg, lung and heart conditioning which can best be practiced riding up hills. Gain an affinity relationship with hills and gravity. Riding fast on flat ground and in general becomes easier after practicing on hills. If you can go 8-10mph up a moderate, 4% gradient hill, you can easily go 17-20+mph on the flats. Additionally, if you ride up a big hill in 5 minutes, the upcoming downhill section will allow you cover more distance in less time, getting you to your destination fast. Speed will increase over time with work and practice. Enjoy the process from within before relying on a fancy bike to get you there, because it alone won't, but your body on a functioning bike, will.
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