| 摘要 |
A bicycle having a rear derailleur arrangement for its drive chain which includes a four-bar linkage consisting of a support, two links, and a coupler, first and second pivots securing the support to the links, and third and fourth pivots securing the coupler to respective links. The support is fixedly fastened to the rear wheel shaft whose axis is parallel to a plane which is perpendicular to the parallel axes of the pivots and defines an angle of 15 DEG -45 DEG with the vertical in the normal operating position of the bicycle. A guide sprocket for the chain is secured to the coupler for rotation in a plane perpendicular to the shaft axis. All four pivots are offset from the shaft in a downward direction, and the first and second pivots are farther from the shaft than the third and fourth pivots.
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