Abstract: The subject invention relates to a type of hub structural improvement, comprising mainly the clutch mechanism that is composed of a clutch and the ratchet teeth of the bearing housing inside the hub; so that the whole unit can independently perform a single-direction brake function; without additional components as in conventional structures; with its high compatibility of components, only the chain wheel support has to be replaced in case of additional function of multi-step speed changes; without replacing many components as in conventional structures, which would result in higher assembling costs; under the trend of ever-changing bicycle specifications, it will reduce the change of measurements of relevant components, thus reducing the production costs.

Abstract: The bicycle gear crank arresting device comprises an axle, a first arresting member and a second arresting member. The axle is fastened pivotally with the five-way tube of a bicycle frame and is provided with a rotary rod. The first arresting member comprises a crank portion having an arcuate section and a linear section, which are connected at an intersection where an inclined line extending from the midpoint of the axis of the axle and forming a predetermined angle with the axis of the axle meets with a straight line extending from the outer side of the gear piece of the first arresting member for a predetermined distance. The linear section is perpendicular to the axis of the axle. The second arresting member has a crank portion corresponding in profile to the crank portion of the first arresting member. The first arresting member and the second arresting member are fastened with the rotary rod of the axle.

Abstract: A hub includes a hub shell having two flanges, a number of ratchet teeth formed in one of the flanges, a spindle rotatably engaged in the hub shell, a sleeve disposed on the spindle and having one or more pawls disposed on the outer peripheral portion for engagement with the ratchet teeth in order to drive the hub shell. The hub can be used in the front portion of the bicycle. The sleeve may include an extension for supporting the sprockets such that the hub can also be used in the rear portion of the bicycle.