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  The Science of Cycling   Introduction What is the Science of Cycling?
  The Wheel Why do road bikes have thin tires, while mountain bikes have fat tires?
  Drives & Gears What is a gear ratio? And how do gears help make the bicycle so efficient?
  Frames & Materials What are the best materials for frames? What are the best designs?
  Braking & Steering How do you stop and steer a bicycle? What forces keep the bicycle from falling over?
  Aerodynamics How does drafting help a cyclist? What is skin friction?
  Human Power Why is the bicycle the most efficient way to travel? How do your muscles work?


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