由美国麻州Danvers市交通公司制造的CM-1000型自行车,不用链条传动,而是垂直脚踏通过钢丝绳来驱动(参看附图)。该自行车的把手、坐椅、踏板等位置都经过周密计算,使其合力能落在脚踏板上。踏板与封闭在罩壳内的围绕在后轮驱动轮毂上的钢丝绳相连。当踏板被压下时,通过钢丝绳、后轮轮毂(与通用自行车一样,内装单向离合器)使后轮转动;当踏板上没有压力时,由 Instead of a chain drive, the CM-1000 bike, manufactured by Danvers City of Massachusetts, USA, is driven vertically by a wire rope (see photo). The bicycle handles, chairs, pedal and other locations have been carefully calculated to work together to fall on the pedal. The pedals are connected to a wire rope enclosed in the casing around the rear wheel drive hub. When the pedal is depressed, the rear wheel is rotated by the wire rope and the rear wheel hub (same as a conventional bicycle with a built-in one-way clutch). When there is no pressure on the pedal,