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The penny-farthing was the standard until the diamond-frame "safety bike" was "invented" and revolutionalized the world of bikes.

It seems to me strange to have to "invent" to put the same size of wheels on a bike, composed of two triangles (the idea of triangles is meny hundreds of years old in civil engineering).

Why did those awkward and dangerous bikes exist?

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Created a new tag "history". Edit away,if you wish. –  Vorac Aug 7 '13 at 9:18
    
Why did those awkward and dangerous bikes exist? Because they were super-awesome, I suppose. –  MrBoJangles Aug 7 '13 at 15:12
    
You could ask: Why was the bike, in any form, not really invented until the 1800s? Certainly the raw technology was there (keeping in mind that "safety bicycle" frames and wheels were initially made with wood). –  Daniel R Hicks Aug 7 '13 at 18:01
    
@DanielRHicks: the raw technology was not there. –  whatsisname Aug 8 '13 at 17:14
    
@whatsisname - How so? Wheeled wagons had been around for at least a thousand years. Metal was available for bearings, and even if not, wood made good bearings if you used a hard wood and charred the bushings. Belts of leather were well within the ability of even the average tinkerer to make. –  Daniel R Hicks Aug 8 '13 at 19:27
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It only seems strange to you because you've had the benefit of never having to learn the lessons of the penny farthing and the technological achievements of the safety bicycle firsthand (aka 'standing on the shoulders of giants syndrome').

The penny farthing is only awkward and dangerous because you are comparing it against a technological leap forward. That technology you are taking for granted, and are not realizing just how difficult it was to develop those technology without having the advantage of already knowing about it. Two of the key pieces of technology in a bicycle you are taking for granted:

JamesBradbury's answer shows the dandy horse.

  • Pneumatic tire: rubber tires didn't exist until 1887, when John Boyd Dunlop invented them. Without pneumatic tires, the ride from a smaller wheeled vehicle would be awful compared to a penny farthing.
  • The chain - The humble, tiny roller chain requires a significant amount of manufacturing sophistication to be made affordable. A bicycle chain has around 500 individual parts that all have to be precisely fit together. Mass production was a fairly new concept, and really only began in the 1850's and first being effectively used during the US civil war. Importantly, the chain wasn't invented until 1880.

The safety bicycle had some initial problems of its own too, it began with a treadle bicycle, prior to the inclusion of the chain drive.

Additionally, the idea of "triangles" and their use as structural members isn't as old as you might think. Sure, people have known for a long time that triangles are 'strong', but our analytical and mathematical knowledge of them is only since the middle 17th century.

So the bottom line: people rode penny farthings because the modern bicycle wasn't invented yet.

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Which civil war? The US one was in the 1860's. –  Dan Neely Aug 7 '13 at 17:39
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Hmm, and the English one started in 1642... anyway, +1 for mentioning the pneumatic tire, which was an angle I hadn't considered. –  JamesBradbury Aug 8 '13 at 7:45
    
Please explain why belt drives were not a feasible replacement for a chain. I think belts were used in Rome. –  Vorac Aug 15 '13 at 8:37
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I think the simple reason is that the drivechain hadn't been invented.

In 1818 the dandy-horse or draisine was invented. This was similar in shape to a modern bicycle, but without pedals. Riders would scoot along with their feet.

Wooden draisine (from wikipedia)

If you want to go a bit faster, especially on any kind of incline, then you need a better way of putting power in. Without a drivechain the only option is pedals connected directly to a wheel. The larger the wheel, the bigger the gearing. The circumference of these wheels was measured in inches and is why you may still hear gear ratios described in gear-inches.

Of course the large wheels were unwieldy and limited by the length of the rider's inside leg.

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As much as cyclists are supposed to dislike cars, I actually think that the car a major reason that the bicycle is decent mode of transportation at all. The safety bike didn't come into existence until 1879. Karl Benz built his first engine for a car in 1878, and patented it the year later. The advances in creating precision machined parts and the need for smooth roads brought about by the popularity of the car, made the bicycle in to a much more suitable form of transportation. Without the advances brought about by the automobile industry, the bike would have been a toy for many more years. –  Kibbee Aug 7 '13 at 12:31
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...and without the roads campaigned for by cyclists, cars wouldn't have taken off, at least if Robert Penn is to be believed. –  JamesBradbury Aug 7 '13 at 13:06
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I just find it really amazing that something as complex as the car, and something as simple (or at least that's how most people see it) as the bicycle were basically invented at the same time. The steam powered motorcycle was made a decade before the safety bike, but nobody thought of adopting the system so you could propel it with your legs rather than an engine. It actually didn't use a chain drive, but actually used leather belts. Now belt drives are back in style, although no longer made of leather. –  Kibbee Aug 7 '13 at 13:26
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Yep, the penny-farthing "evolved" from attempts to add pedals to the above design. It's worthwhile to remember that in order to have the "safety bicycle" you needed a chain or belt, and those weren't invented (and available as manufactured units) until they were needed for industrial purposes, mostly related to power transmission from some sort of combustion engine. So the (internal/external) combustion engine led to the invention of the safety bike. –  Daniel R Hicks Aug 7 '13 at 16:16
    
@jamesBradbury You could probably expand your argument to encompass all sorts or precision machined parts. You could have made a modern bicycle equivalent, but it would have been impossibly unwieldy (e.g. leather belt drive). Once you could get miniature (by the standards of the day) sprockets, chains, bearings, etc you could all of a sudden make the technology "leap" to build the modern bicycle. –  Byron Ross Aug 13 '13 at 23:58
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Don't forget, when the penny farthing was invented, horses were still a major mode of transport - when you see people on horseback regularly, the idea of sitting that high up doesn't seem unreasonable.

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