Bicycle Frame Construction

A unitary monocoque frame for a bicycle comprising:

• a right half shell having a peripheral edge, said right half shell including an outer side having a generally smooth surface, an opposing inner side having a plurality of reinforcing ribs with a recessed segment in which the depth of said plurality of reinforcing ribs is reduced, an integrally formed head tube portion, and an integrally formed seat tube collar;
• a left half shell having a peripheral edge symmetrical with said peripheral edge of said right half shell, said left half shell including an outer side having a generally smooth surface, an opposing inner side having a plurality of reinforcing ribs with a recessed segment in which the depth of said plurality of reinforcing ribs is reduced, a curved surface to join with said head tube portion, and a cupped recess to receive said seat tube collar;
• and
• wherein a bonding adhesive is applied to a tongue extending along and protruding from at least a portion of said peripheral edge of said left half shell in mating engagement with a groove extending along and recessed in at least a corresponding portion of said peripheral edge of said right half shell to join said right and left half shell forming said unitary monocoque frame.