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The Auto-Wheel was a self-contained engine and fuel tank that could be clipped to any bicycle. The combination could reach up to 40 km/h. Its maker was International Auto-Wheel Co. during the 1910s and the company was backed by Arthur Conan Doyle, author of Sherlock Holmes.
Features
118 cc, Single cylinder, 4 stroke
References
Auto-Wheel Wikipedia(Text) CC BY-SA