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Public transportation was changed forever in the mid-19th century with the revolutionary bicycle design from French engineer Pierre Michaux. Soon after that scores of other inventors begun to improve bicycle in their own designs, bringing it more and more to mainstream use.
History of tricycle began much before first two-wheeled bicycles arrived on the market. More than century earlier, first tricycles with hand-powered propulsion mechanisms marked the beginning of the history of tricycles.
History of bicycles cannot be told without mentioning Penny-farthing, a very specific type of bicycle that was highly popular during end of Victorian Era and before arrival of modern “safety” bicycles.
Unicycle is a specific type of bicycle whose history started shortly after introduction of the popular penny-farthing bicycles who managed to train drivers how to easily balance their weight by sitting on one big wheel. Here you can read more about history of unicycle.