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Ordinary bicycle employing the first gear system and having a smaller rear wheel. The Kangaroo invented in 1878, with the world's first gear system, added brakes to the ordinary cycle which had become more and more dangerous due to the increasing diameter of the front wheel for riding at faster speeds. Patented by Otto and Wallace, this model had independent right and left chainwheels driven by their own chains, enabling fast speeds even with a smaller front wheel.