Collapsible bicycle

A bicycle frame comprising:

• a front frame having a top tube, a down tube, and a head tube, the top tube being attached to the head tube, and the down tube being positioned below the top tube and further being attached to the head tube;
• a rear frame having a pair of spaced-apart seat stays, a pair of spaced-apart chain stays, and a bottom bracket shell, each of the seat stays and the chain stays having a rear end and a front end, the rear ends of the seat stays and the rear ends of the chain stays being connected to a rear drop out, the front end of each chain stay being connected to the bottom bracket shell, and the down tube being releasably connected to the bottom bracket shell;
• a seat tube arranged between the front frame and the rear frame and coupled to the front frame and the rear frame, the seat tube having an upper tube and a lower tube, the upper tube and the lower tube being selectively rotatable with respect to one another, the upper tube being connected to the top tube, the lower tube being connected to the front end of the seat stays, and the bottom bracket shell being connected to the lower tube;
• a locking coupler for selectively securing the upper tube of the seat tube to the lower tube of the seat tube to thereby restrict rotation therebetween, the locking coupler having a first male coupling and a first female coupling, the first male coupling including a first male ball portion having a spherical geometry, and the first female coupling including a first female receptacle portion configured to receive the first male ball portion, the first female coupling being formed by a clamp bracket that includes a first opposed clamp bracket portion and a second opposed clamp bracket portion, the clamp bracket defining a split opening that extends longitudinally through the clamp bracket, separating the first opposed clamp bracket portion from the second opposed clamp bracket portion;
• and
• a cam lever mechanism operably connected to the clamp bracket and configured to provide clamping force to draw the first opposed clamp bracket portion and the second opposed clamp bracket portion toward one another to secure the first male ball portion within the first female receptacle portion;
• wherein the bicycle frame is adapted to be configured in a first position or a second position, in the first position the front frame is positioned forwardly of the seat tube, and in the second position the front frame is rotated rearwardly of the seat tube, wherein the bicycle frame is moved from the first position to the second position by disconnecting the down tube from the bottom bracket shell and rotating the upper tube of the seat tube with respect to the lower tube of the seat tube.