Foldable bicycle

A foldable bicycle comprising:

• a) a stem tube comprising first, second and third sections, said first stem tube section being slidably mounted in said second stem tube section;
• b) a pivotal coupler, the coupler pivotally linking the second stem tube section to said third stem tube section;
• c) a handle bar mounted on said first stem tube section;
• d) a head tube, said third stem tube section being rotatably mounted in the head tube;
• and,
• e) a second pivotal coupler, a top tube having a first top tube section pivotally linked to a second top tube section by the second coupler, said first top tube section being fixed to said head tube,
• f) a down tube and a seat tube, said second top tube section being fixed to the down and seat tubes,
• g) a seat post slidably mounted on the seat tube;
• h) said second pivotal coupler comprising:
• i) a first bracket including a flat body having a first side fixed to the first section of said top tube;
• ii) the first bracket having first and second flat portions formed on a second side thereof;
• iii) a sleeve extending from said first flat portion towards said second flat portion;
• iv) said first flat portion defining a first hole and a second hole;
• v) said second flat portion defining a first hole and a second hole;
• vi) a second bracket including a flat body having a first side, said second section of said top tube being fixed to the first fiat body side;
• vii) the second bracket having a second side;
• viii) a first sleeve and a second sleeve fixed to the second side of the second bracket;
• i) a fastener extending through said first holes and pivotally linking said second bracket to said first bracket;
• and
• j) a quick-release device comprising a latch insertable through said first bracket second hole, the first bracket sleeve and said second bracket first sleeve, for retaining said pivotal coupler in a locked position.