Soru

Passage

The evolution of the modern bicycle is a story of iterative mechanical improvements designed to increase speed, stability, and rider comfort. The journey began in 1817 when German baron Karl von Drais built a steerable, two-wheeled wooden vehicle. Patented in 1818 as the 'draisienne' (and often called the 'running machine' or 'dandy horse'), this device lacked pedals. Instead, riders sat astride a wooden frame and propelled themselves by pushing their feet against the ground in a walking motion. Although it demonstrated that a rider could balance on two wheels, the physical exertion required to operate it on rough carriage roads limited its widespread adoption.

For decades, the design remained a novelty until the early 1860s in Paris. Carriage makers Pierre and Ernest Michaux modified the design by attaching cranks and pedals directly to the front wheel's axle. This machine, called the 'velocipede,' allowed riders to propel themselves without touching the ground. However, because its frame was made of wrought iron and its wheels were wooden with iron bands, the vehicle transmitted every bump in the road directly to the rider. The resulting rough ride earned the velocipede the popular nickname of the 'boneshaker.'

In the 1870s, British engineers sought to make the bicycle faster. Because the pedals were still directly attached to the wheel axle, the only way to increase speed was to make the drive wheel larger. This led to the creation of the 'ordinary bicycle,' commonly known as the 'high-wheeler' or 'penny-farthing' because its wheels resembled the large penny and small farthing coins of the era. The front wheel grew to diameters of up to five feet, while the rear wheel shrank to a fraction of that size. These bicycles featured solid rubber tires and wire-spoked wheels, which slightly cushioned the ride. However, their high center of gravity made them extremely dangerous; hitting a stone could throw the rider forward over the handlebars in a crash known as a 'header.'

Recognizing the need for a safer design, English inventor John Kemp Starley introduced the Rover Safety Bicycle in 1885. The Rover featured two wheels of nearly equal size and a chain drive mechanism that connected the pedals to the rear wheel. This meant the bicycle could travel fast without requiring a dangerously large front wheel. The final major improvement came in 1888 when Scottish inventor John Boyd Dunlop patented the pneumatic (air-filled) rubber tire for bicycles. Dunlop’s invention replaced the jarring solid rubber tires, providing a smooth ride and securing the bicycle's place as a practical mode of daily transportation.

Based on the passage, in what chronological order did the following developments in bicycle design occur, from earliest to latest?