Abstract: An exercise bicycle wheel comprises a pair of facing fly wheel halves. The flywheel halves include spokes which extend outwardly from a hub portion and terminate in concave rim portions which face one another. When the two halves are joined, the rim portions define a water tight cavity. This cavity is filled with a heavy material which is initially flowable and which sets in the cavity. Preferably the mixture includes hematite chips, magnetite powder, hydrated lime, portland cement, a water reducer, and water.

Abstract: A foldable stair climber exercise machine includes a central frame having a main support beam, a second support pivotally connected to the main support beam, and a cross-member pivotally connected to the second support and removably connected to the main support. Stepping members on opposite sides of the central frame are pivotally connected to the second support and are connected by a flexible linkage. Air cylinders are removably connected to the stepping members and pivotally connected to the frame. Because the frame members are easily disconnected and pivotal with respect to each other, and because the air cylinders are easily disconnected from the stepping members, the disclosed stair climber is easily folded to a flattened assemblage for storage.

Abstract: A bicycle frame with improved rigidity and strength is disclosed. The frame has a truss portion and upper and lower stays for connecting a rear wheel to the truss portion of the frame. One or both of the stays comprise a U-shaped tubular member having a curved portion and two leg portions, the leg portions positioned to straddle the rear wheel, and a second tubular member extending between the truss portion of the frame and the curved portion of the U-shaped tubular member. The second tubular member is shaped at one end so as to terminate in gussets that at least partially surround the curved portion of the U-shaped member. In preferred embodiments, the second tubular member is flattened at the end connecting to the U-shaped tubular member to have an elliptical cross-section with an inside minor axis dimension substantially equal to the outside diameter of the U-shaped tubular member, and the gussets terminate at about the centerline of the U-shaped tubular member.

Abstract: An exercise bicycle flywheel (1) comprises a pair of facing concave sheet metal discs (15A, 15B). The space defined between the discs is filled with a heavy material (M) which is a mixture of hematite chips, magnetite powder, hydrated lime, portland cement, and water.

Abstract: A stationary exercise device has an elongated base frame, a seat supported by the base frame adjacent one end and a non-circular upright support adjacent the other end of the frame, and an exercise cycle assembly removably mounted on the support. The device preferably doubles as a rowing machine, the handle bars of the rowing machine serving a dual purpose.

Abstract: A bicycle frame with a down tube, seat mast, and rear fork has a crank hanger in the form of an open bottomed bell having substantially planar front, top and rear surfaces substantially perpendicular to long axes of the lower ends of the down tube, seat mast and rear fork respectively and parallel to end surfaces thereof, the end surfaces squarely butting the respective bell surfaces and being secured thereto. A crank bearing assembly is readily mounted in the crank hanger, and held therein with a single cotter pin, permitting easy demounting as well. The axle shaft of a crank is journaled in bearings mounted in housings of a size to fit closely within an enlarged portion of key hole slots in opposite parallel side walls of the bell, but too large to pass through neck portions of the key hole slots.