Stretchable bicycle

A stretchable bicycle comprising:

• a front frame comprising a head tube, a sliding bar extended rearward from the head tube, a stem extended downward from a handlebar to couple to the top of the head tube, a front fork extended downward from the stem, and a front wheel rotatably supported at bottom ends of the front fork;
• and
• a rear frame comprising a chain stay, a seat stay, a rear wheel, a bottom bracket with a pair of pedals and a drive mechanism coupled thereto, a support tube and an offset seat tube parallel with the support tube both extended upward from the bottom bracket, a cross tube opening at both its front and rear ends formed at a top of the support tube, being adapted to telescopically receive the sliding bar of the front frame, a sliding seat tube extended from and slidably received in the offset seat tube which is laterally adjacent to the cross tube, a saddle on a top of the sliding seat tube, a seat post formed at a lateral extension from the top of the sliding seat tube for supporting the saddle right above the cross tube, and two quick-releases for fastening the sliding bar at both ends of the cross tube respectively.