FIELD: mechanical engineering; bicycles and velotrainers. SUBSTANCE: speed change mechanism is made in form of coupling 8 arranged on crank 6. Number of teeth of driven sprocket 2 is equal to half the number of teeth of driving sprocket 3. Driven sprocket is made with eccentricity equal to half of maximum elongation of chain. EFFECT: enhanced reliability and convenience in use. 3 cl, 5 dwg
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