In the bicycle rack rejection structure of the present invention, the inclined surface formed by the tapered surface or spherical surface formed at one end of the crankshaft assembly is combined with the corresponding inclined surface of the hanger portion, and the other end of the sleeve is screwed Fix by attaching and screwing on the one side only. This makes it possible to impart one or both of the female threads to the left and right lugs of the hanger portion without giving the influence of deformation of the female screw due to thermal deformation of the left and right lugs of the hanger portion to the rotational state of the crankshaft, It is possible to complete the screwing work for mounting the crankshaft in only one place, so that the operation of the crankshaft is simple and the workability is improved, and the crankshaft rejection structure in which the rotation state of the crankshaft is not lowered can be obtained.
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