A process for building recumbent bicycles to fit their riders. The first step is to build an adjustable recumbent bicycle frame designed for adjustability in the location of all the major elements of the bicycle; including position and angle of seat, position of wheels and pedals or other foot power means, position and caster angle of steering axis and position of handlebars or other steering means. Then individual riders or classes of riders test the adjustable frame model, and work out configu...

A recumbent cycle whose seat can be quickly repositioned on the frame to provide for adjustable spacing between the seat and the pedal assembly. The seat has a rod which extends rearwardly from the backseat portion thereof at a location near the upper portion of the back seat and the rod is slidably received in a tubular portion of the frame. in one embodiment, the tubular portion of the frame has an aperture extending therethrough, and the rod portion of the seat has a spaced apart series of ap...

A bicycle in which the frame is so constructed that the pedal crank is displaced forwardly of the center of the back wheel by a distance equal to at least twice the radius of the back wheel, and the rear frame member has a length equal to at least twice the radius of the back wheel, and the steering column housing is slanted at an angle of between 62.degree. and 58.degree. to the horizontal, and the saddle support column has a length equal to between 1.2 and 1.4 times the radius of the back whee...

A front frame for a bicycle includes an upper tube, a lower tube and a head tube all of which are made of fiber reinforced material. The head tube extends integrally from a front end of the upper tube and a front end of the lower tube. The head tube has a chamber communicates with a chamber of the upper tube and a chamber of the lower tube. Two inner tubes are provided in the chamber of the upper tube. The abutted portions of the two inner tubes form a rib such that the structure strength of the...

A recumbent bicycle having a single stroke linear type of pedaling wherein both legs protract and retract simultaneously so that a single push is made instead of alternating pushes. Various other adjustements are posssible to accomodate the length of a user legs and the degree of extension desired.

A body frame for a vehicle includes a head pipe on which a front fork is mounted for permitting a turning movement. A box-shaped box frame portion extends obliquely rearward and downwards from the head pipe. A twin tube portion extends obliquely downward and rearward on the left and right sides from a rear end of the box frame portion. The twin tube portion has a smaller width than the width of the box frame portion. A rear frame portion extending obliquely rearward and downward from the rear en...

A road luge includes an elongated frame having a front end and a back end, a strut extending rearwardly and upwardly from the back end of the frame, a back axle supported on the strut and fixed in orientation relative to the frame, and a single back wheel rotationally mounted on the back axle along the centerline axis of elongation of the frame. The road luge has a front assembly attached to the frame at a location adjacent to the front end of the frame. The front assembly includes two rotationa...

This bicycle, novel in both functionality and design, is a modified upright bicycle, which, because it incorporates a seat which is adjustable along an inclined Seat Beam, provides optimum dimensions for each individual rider. In addition, it exhibits improved safety, maneuverability, comfort and efficiency of operation.

A bicycle includes a bicycle frame, a wheel set, a treading unit, a handlebar unit, and a seat unit. The bicycle frame has front and rear ends. The wheel set includes front and rear wheels disposed respectively on the front and rear ends of the bicycle frame. The treading unit is mounted on the bicycle frame for transmitting treading power to the wheel set. The handlebar unit is mounted on the bicycle frame and is coupled to the front wheel to permit steering of the front wheel. The handlebar un...

A low-drag bicycle comprising an elongated, two piece, generally tubular frame of elliptical cross-section extending between the front and rear wheels wherein the cyclist assumes a recumbent position over the frame facing down and powers the cycle by means of a pedal arrangement and transmission directly connected to and concentrically arranged with the rear wheel axle.