Abstract: A retaining device used in a bicycle including a body having a stepped recess, an aperture and a slit, a head having a circumferential groove provided on a distal end, two cables whose first distal ends are respectively and securely connected with the body and the head, and two members each respectively and securely connected to second distal ends of the two cables by their respective first ends. Second ends of the two members are pivotally connected with each other. Therefore, after the circumferential groove of the head is received within the stepped recess and the two cables are folded together, the retaining device of the invention is ready to be received within a handlebar of the bicycle.

Abstract: A pivotable handlebar stem for use in a bicycle enables a user to ride on a bicycle normally when the stem is securely engaged with a column. Due to the provision of resilient devices provided within the column and undulating end faces between the engaging face of the column and the stem, the handlebar together with the stem are able to be detachably connected with the column, such that the bicycle will not occupy too much space when parked.