Abstract: A method for making a wheel rim includes the steps of: A) casting an aluminum alloy containing silicon and magnesium into a blank including a lateral portion and a disk portion that is surrounded by the lateral portion and that has a plurality of radial elements extending toward and connected to the lateral portion; B) forging the disk portion of the blank to form the radial elements into radial ribs; C) solution heat-treating the blank after forging; and D) spinning the lateral portion to form a rim body.

Abstract: A wheel rim assembly includes a wheel rim, a cover, and a binder. The wheel rim includes a rim portion having two axially opposite end rings, and a disk portion having a plurality of radially extending spokes connected to one of the end rings. The cover covers the one of the end rings and the disk portion, and has a plating layer formed thereon opposite to the disk portion of the wheel rim. The binder bonds the cover to the wheel rim.

Abstract: A stationary exercise bicycle including a base frame, a seat supporting assembly, a seat assembly being movably mounted on the seat supporting assembly to be guided along a path inclined at a selected angle related to the ground surface. The stationary exercise bicycle further comprises an assistance member attached to the seat assembly for providing an elevation force for a seat position adjustment. The present invention provides a stationary exercise bicycle with a benefit of quick, easy and convenient seat position adjustment, a benefit of grabbing a heart rate grip or touching a control console comfortably, a benefit of reducing abdomen compression of a user, and a benefit of an elevation force for assisting a seat position adjustment.