Abstract: A rear derailleur with rotation resistance application function includes a base member, a link assembly, a movable member, and a chain guide, wherein the base member is mounted on a frame; the link assembly is flexibly connected between the base member and the movable member; and the chain guide is connected to the movable member via a rotation-with-resistance structure. The rotation-with-resistance structure includes a rotary shaft, a one-way bearing and a resistance application spring, wherein the rotary shaft is disposed on the movable member or the chain guide; the one-way bearing matched with the rotary shaft is correspondingly disposed on the chain guide or the movable member; and the rotary shaft forms an interference fit with an inner hole of the one-way bearing. The rear derailleur can effectively prevent a chain from coming off during bumping.

Abstract: A rear derailleur with rotation resistance application function includes a base member, a link assembly, a movable member, and a chain guide, wherein the base member is mounted on a frame; the link assembly is flexibly connected between the base member and the movable member; and the chain guide is connected to the movable member via a rotation-with-resistance structure. The rotation-with-resistance structure includes a rotary shaft, a one-way bearing and a resistance application spring, wherein the rotary shaft is disposed on the movable member or the chain guide; the one-way bearing matched with the rotary shaft is correspondingly disposed on the chain guide or the movable member; and the rotary shaft forms an interference fit with an inner hole of the one-way bearing. The rear derailleur can effectively prevent a chain from coming off during bumping.

Abstract: A bicycle gear shifter comprises a shift positioning ratchet provided with positioning teeth, release teeth, and drive teeth, a drive member for rotating the shift positioning ratchet, a mounting member mounted on a bicycle handlebar, a resettable positioning member, a release member for driving movements of the resettable positioning member, a fixing member connected to the mounting member, and an actuating member for driving the shift positioning ratchet to reversely rotate. The shift positioning ratchet and the actuating member are mounted on the fixing member by a rotatable main shaft, the resettable positioning member is sleeved around the rotatable main shaft, and a positioning pawl is provided for engaging with the positioning teeth. The drive member is sleeved around the rotatable main shaft and is provided with a driving part engaging with the driving teeth.

Abstract: A bicycle gear shifter comprises a shift positioning ratchet provided with a number of positioning teeth, release teeth and drive teeth, a drive member for driving the rotation of the shift positioning ratchet, a mounting member mounted on a bicycle handlebar, a resettable positioning member, a release member for driving movements of the positioning member, a fixing member connected to the mounting member, and an actuating member for driving the shift positioning ratchet to reversely rotate. The shift positioning ratchet and the actuating member are mounted on the fixing member by a rotatable main shaft, the positioning member is sleeved around the rotatable main shaft, and the positioning pawl engages with the positioning teeth. The drive member is sleeved around the rotatable main shaft and is provided with a driving part engaging with the driving teeth.