Patent ID: 8689663

Claim:
A bicycle anti-theft device comprising: a pedal reversibly installable in a crank; an opening on the outboard end of the crank; a pedal axle comprising a stopping means, a mounting end rotatably fixed on the crank and a mounting end engagement; a locking means for securing the pedal axle to the crank, the locking means being operated by a key for locking and unlocking the locking means to the mounting end, wherein the cross-section of the mounting end and the cross-section of the opening has a matching shape; said shape being selected from the group consisting of: polygonal elements, spline elements, a combination of polygonal and spline elements, and a combination of polygonal and round elements, wherein the stopping means is used to control a depth that the mounting end is inserted into the matching opening so as to align the locking means and the mounting end engagement, wherein the locking means engages the pedal mounting end symmetrically across the thickness of the crank at the mounting end engagement; and wherein, when the pedal is reversely installed in the crank, the pedal resists rotation of the crank and cannot be used to pedal the bicycle away.