Abstract: A detachable accessory carrier for bicycle includes a fixed seat, a positioning member and a fastener. The fixed seat has a positioning portion and a fixing portion communicated mutually. The positioning member has an inserting portion that includes a propping portion corresponding to the fixing portion so that when the inserting portion of the positioning member is assembled to the positioning portion of the fixed seat, the fastener can be coupled with the fixing portion and abut against the propping portion of the positioning member, thereby attaching the detachable accessory carrier reliably to the frame tube of the bicycle. The detachable accessory carrier can be partially detached with only the fixed seat left on the frame tube of the bicycle. The fixed seat has a rim conforming to a periphery of the frame tube so it will not interfere with the cyclist's riding or scrape the cyclist's skin.

Abstract: A pitch adjusting mechanism for a bicycle saddle is arranged between a saddle and a seat post of the bicycle and includes: a base beneath the saddle; a connecting member being fixed to the seat post; a washer being removably assembled to a top or a bottom of the connecting member; and a fastener combining the connecting member, the washer and the base as a whole. When the washer is arranged on the top and beneath the bottom of the connecting member, a pitch of the saddle with respect to the seat post is different.