A wheel suspension system for two-wheeled vehicles such as motorcycles, bicycles, and the like, having a vehicle frame, a wheel assembly and a spring and shock absorber assembly. The wheel assembly includes an axle with a wheel rotatably disposed thereon. Paired wheel plates are rotatably attached to the opposite ends of the axle. A first pair of upwardly extending wheel supports have one end thereof secured to the wheel plates and the other end thereof attached to one end of the shock absorber assembly. The other end of the shock absorber assembly is attached to the vehicle frame. A second pair of wheel supports, extending transversely of the first supports, have one end thereof secured to the wheel plates and the other end thereof attached to the vehicle frame.

A bicycle frame having shock absorbing characteristics. The bicycle frame generally comprises a head tube and a seat tube having an elongate crossbar rigidly attached thereto and extending therebetween. Rigidly attached to and extending between the seat tube and the crossbar is a shock absorber. The bicycle frame further includes first and second chain stay members having front ends pivotally connected to the opposed sides of an axle receiving sleeve attached to the lower end of the seat tube and rear ends adapted to support a tire axle therebetween. Additionally, first and second seat stay members are rigidly attached to and extend between the shock absorber and the rear ends of the chain stay members. Upon the exertion of a downward force to the seat tube, the chain stay members are caused to pivot upwardly thereby compressing the shock absorber via the movement of the seat stay members.

A shock-absorbing frame structure for bicycle includes a front frame unit formed of a head tube, a down tube, a seat tube, and a top tube, a bottom forks unit pivoted to the front frame unit, and a shock-absorbing device coupled between the front frame unit and the bottom forks unit, the seat tube having a seat pillar for holding a saddle and a top end for holding a seat back, the bottom forks unit including two bottom forks, and a connector connected between the bottom forks at a front side and pivoted to a bottom lug at the front frame unit, a cross tube connected between the bottom forks on the middle, an upward lug formed integral with the cross tube to support the shock-absorbing device, and an arched frame rod bridging the bottom forks at a rear end for the mounting of a luggage-carrier and a rear fender.

A bicycle frame is provided with a steering tube, a saddle tube, a top tube and an inclined tube as well as a fork for a front wheel held on the steering tube and another fork or swing unit for a rear wheel as well as a pedal bearing unit held on the frame. The top tube has a forward first tube section fastened to the steering tube and connected with a second saddle tube section fastened on the saddle receiving tube. The forward tube section may comprise an elongated tube part of the inclined tube and, between the sections and the inclined tube, has a junction in a plane below the connection of the saddle tube section on the saddle receiving tube and the connection of the additional tube section on the steering tube.

A bicycle frame which includes a shock absorber assembly which is coaxial and integral with the top tube of the frame. The entire shock absorber assembly is positioned within the top tube and thus completely forward of the seat tube and rearward of the head tube. The frame typically comprises two rear wheel support tubes each of which is integral with a rear wheel dropout at their lower end and each of which is detachably connected to one of two compression struts at its upper end. Each of the compression struts is separately, detachably and pivotally connected to the shock absorber assembly. The rear wheel dropout holds the axle of a rear wheel. The frame is configured such that when the rear wheel moves upward as in traversing a bump on the road the rear wheel dropout undergoes an arcuate motion which is translated to a linear motion of a piston in the shock absorber assembly via the rear wheel support tube and compression struts.