Abstract: A shock-absorbing front fork for a bicycle includes an inner part securely inserted in the crown of the front fork. The inner part includes multiple first slots and second slots defined axially in the outside thereof. Each first slot receives a pin therein, and each second slot receives a roller therein. A rod extends through a dust-proof unit, a first ring and a spring. The lower section of the rod is connected to the top end of the inner part. An outer part is a tube which includes multiple first grooves and second grooves defined axially in the inner periphery thereof. The outer part is mounted to the inner part. The pins are partially accommodated in the first grooves, and the rollers are partially accommodated in the second grooves. The outer part is axially movable relative to the inner part by the pins and the rollers with less friction.

Abstract: A front fork shock-absorbing device includes a front fork and a shock-absorbing unit is located in the first space in the front fork. The shock-absorbing unit includes a driving unit and a spring rate adjustment device. The driving unit contacts an operation end of the spring rate adjustment device. A DC power unit is located in the second space of the front fork and electrically connected to the driving unit. The shock-absorbing unit provides shock-absorbing features to the front fork. The spring rate adjustment device is adjusted according to the road condition to provide comfortable riding to the users.

Abstract: An adjusting structure for a seat tube of a bicycle includes a seat tube, two engaging blocks, two cover members, and a locking unit, wherein two engaging blocks are symmetrically provided on two sides of a positioning seat of the seat tube, and the engaging blocks engages with each other by using the positioning seat, the two cover members are symmetrically fixed on outer sides of the two engaging blocks, and a locking unit laterally passes through the above-mentioned components and allows to be alternatively rotated tightly or loosely, thereby adjusting a saddle to become inclined and to move forward and backward easily.