Patent ID: 7216883
Filing Date: 2007-05-15
Classification: B62K

Abstract:
1. A rear wheel suspension system for a bicycle having a frame with a bottom bracket, a seat tube, a top tube and a down tube, the suspension system comprising: upper and lower pivots adapted to be fixed to said frame at two spaced apart points thereon, said upper pivot being disposed on said seat tube rearward of a first reference axis extending between said bottom bracket and an intersection between said seat tube and said top tube, said lower pivot being disposed proximate said bottom bracket; a first link member having a first end pivotally connected to said upper pivot and a displaceable second end pivotable about said upper pivot; a swing-arm having a forward end pivotally connected with said lower pivot directly to said frame, said swing-arm having a wheel mounting bracket at a rear end thereof for receiving a rear wheel axle such that said rear wheel axle pivots about said lower pivot with a constant radius of rotation, said swing-arm being pivotally connected with said first link member via an intermediate lower link member having a forward end pivotally connected to said first link member at a point thereon intermediate said first and second ends, the intermediate lower link member having a rearward end pivotally connected to said swing-arm, the swing-arm rotating in a direction opposite to that of the first link member as the rear wheel suspension system compresses; and a shock absorber having a first end pivotally connected to said displaceable second end of said first link member and a second end adapted for connection with said frame.