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The Imme R100 was a lightweight motorcycle made by Riedel AG from 1948 to 1951. It is noted for its simple and innovative design with many advanced features. With low cost and technical innovation, the R100 sold well, but reliability problems and low profit margins resulted in warranty costs driving Riedel AG into bankruptcy. The advanced specification of the Imme R100 caused it to be highly regarded. The R100 was one of the motorcycles included in "The Art of the Motorcycle" exhibition at the Solomon R. Guggenheim Museum in 1998 and is on permanent display at Barber Vintage Motorsports Museum. ==Concept, design and engineering== Motorcycle engineer Norbert Riedel recognized the need for a simple and economical light motorcycle during Germany's recovery from the Second World War and began to design one. By the summer of 1947, a prototype frame had been built and tested. The spine frame was made from 40 mm steel tubing, as were the steering head, the single-sided front fork, and the single-sided swingarm. The wheels were interchangeable, and were mounted from the left on stub axles attached to the suspension on the right. Riedel developed the engine at the same time. This was a piston-ported two-stroke single-cylinder engine of capacity. The engine was cast in light alloy around the cylinder liner, and had an integral cylinder head. The crankshaft was suspended on only one side. The power output of the engine was at 5,800 rpm, which was considered a high output at the time. Contemporary engines of comparable size typically made about , and 4.5 PS was expected from 125 cc engines such as those used in the DKW RT 125 and the later Hoffmann Vespa.〔 The transmission had three speeds with no neutral position; a mechanism held the clutch open when the motorcycle was at idle in first gear. First gear was positioned in the middle of the shift pattern, with second gear below and third gear above. The engine and transmission were mounted together on the swingarm in front of the pivot axle at the bottom of the spine frame. The near-horizontal engine and transmission together as a unit formed a "power egg" style which would later be used by Benelli and Motobi. The tubular swingarm also served as the exhaust pipe. Behind the pivot axle, the swingarm, the reinforced rear fender, and the supports for the rear carrier formed a triangular structure which supported the rear spring. This suspension system allowed a long suspension travel and a soft spring rate. Test rides on the complete prototype began in December 1947 and showed that the combination of long travel and soft springs needed damping. Friction dampers were added. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Imme R100」の詳細全文を読む スポンサード リンク
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