You don’t have to understand the physics behind riding a bicycle to enjoy a good ride, but if you want to find out how things work, you can’t do better than perusing this site. Topics include the wheel, frames and materials, aerodynamics, drives and gears, braking and steering, and probably the most important to make cycling really work, human power. You get a taste of the history of the development of bicycle in each section. The physics parts are easy to read and include some interactive calculations and other activities. Listen to and watch some competitive bicyclists talk about their techniques.
courtesy of Knovation