Bicycle - Evolving
Time: 1900s
Place: France
Details: Bicycles continued to evolve to suit the varied needs of riders, as derailleur gears, a variable-ratio transmission system commonly used on bicycles, consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another, developed in France between 1900 and 1910 among cyclotourists, and was improved over time.
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