Convertible bicycle frame

Claim 1

A KNOCK-DOWN BICYCLE FRAME CONVERTIBLE AT WILL FROM ONE FRAME TYPE TO THE OTHER COMPRISING: A BASIC FRAME STRUCTURE INCLUDING A LOWER REACH TUBE, A HEAD POST TUBE AND LOWER REAR WHEEL FORK PERMANENTLY SECURED ON THE LOWER REACH TUBE, A SEAT MAST TUBE HAVING A SADDLE ELEMENT RIGIDLY ATTACHED TO ITS BOTTOM END AND DETACHABLY SECURED TO THE LOWER REACH TUBE, AN UPPER REAR FORK STRUCTURE PROVIDING A PAIR OF STRUT PORTIONS DETACHABLY SECURED AT THE UPPER END TO THE TOP REGION OF THE SEAT MAST TUBE, THE LOWER ENDS OF THE STRUT PORTIONS BEING DETACHABLY SECURED TO THE RESPECTIVE BACK ENDS OF THE PRONGS OF THE LOWER REAR FORK; ANCHOR MEANS ON THE UPPER PORTION OF THE HEAD POST TUBE; AND AN UPPER REACH BAR WITH FRONT END DETACHABLY SECURED ON THE HEAD POST TUBE BY SAID ANCHOR MEANS AND BACK END SELECTIVELY SECURED AT THE TOP REGION OF THE SEAT MAST TUBE OR ON THE LOWER PORTION OF THE SEAT MAST TUBE IN SPACED RELATION FROM THE LOWER REACH TUBE.