Patent ID: 8820764

Claim:
A bicycle frame comprising: a. a head tube; b. a top tube; c. a down tube; d. a bottom bracket; e. a seat tube, the top tube, and the down tube defining a first substantially triangular assembly in which the top and down tube are affixed to the head tube at a first intersection, the seat tube and down tube are affixed to the bottom bracket at a second intersection, and the top tube is affixed to the seat tube at a third intersection; f. a pair of seat stays; g. a lower pair of chain stays, the seat tube, seat stays, and lower chain stays defining a second substantially triangular assembly in which the seat stays are affixed to the seat tube at the third intersection, and the lower chain stays and down tube are affixed to the bottom bracket at the second intersection; h. a pair of upper chain stays affixed to the down tube at first attachment points, the seat tube at second attachment points, and the bottom bracket at third attachment points, whereby, the addition of the upper chain stays adds rigidity to the frame to resist torque forces applied to the bottom bracket.