Found this over at Clevercycles. I’ll post a bit here:

Man on a bicycle can go three or four times faster than the pedestrian, but uses five times less energy in the process. He carries one gram of his weight over a kilometer of flat road at an expense of only 0.15 calories. The bicycle is the perfect transducer to match man’s metabolic energy to the impedance of locomotion. Equipped with this tool, man outstrips the efficiency of not only all machines but all other animals as well.

[…]

The invention of the ball-bearing signaled a fourth [transport] revolution. This revolution was unlike that, supported by the stirrup, which raised the knight onto his horse, and unlike that, supported by the galleon, which enlarged the horizon of the king’s captains. The ball-bearing signaled a true crisis, a true political choice. It created an option between more freedom in equity and more speed. The bearing is an equally fundamental ingredient of two new types of locomotion, respectively symbolized by the bicycle and the car. The bicycle lifted man’s auto-mobility into a new order, beyond which progress is theoretically not possible. In contrast, the accelerating individual capsule enabled societies to engage in a ritual of progressively paralyzing speed.

The monopoly of a ritual application over a potentially useful device is nothing new. Thousands of years ago, the wheel took the load off the carrier slave, but it did so only on the Eurasian land mass. In Mexico, the wheel was well known, but never applied to transport. It served exclusively for the construction of carriages for toy gods. The taboo on wheelbarrows in America before Cortes is no more puzzling than the taboo on bicycles in modern traffic.

Emphasis added!

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