Abstract: A stabilizing wheel assembly has a support frame construction releasably securable to a bicycle and a stabilizing wheel secured to the support frame construction. The latter includes a substantially planar main plate attachable to the bicycle seat stay and the chain stay; a support bar affixed at one of its ends to the main plate and extending generally perpendicularly therefrom; and a fork unit having fork blades straddling the stabilizing wheel and being held on the support bar for a swinging motion in a plane parellel to the main plate. There is further provided an abutting mechansim carried by the support bar and arranged in a path of the swinging motion of one of the fork blades.

Abstract: A bicycle/scooter combination has a support tube assembly including two lower support tubes each having a front terminus affixed to the head tube; a downwardly extending front portion; a rearwardly extending horizontal portion; and an upwardly extending rear portion including a rear terminus of the lower support tubes. The rear terminus is affixed to the bracket shell. There is further provided an upper support tube having an upper terminus affixed to the head tube and a lower terminus attached to the rearwardly extending horizontal portion of the lower support tubes; a horizontal platform supported by the rearwardly extending horizontal portions of the lower support tubes; and chain stays each having a front end affixed to the upwardly extending rear portions of the lower support tubes and a rear end carrying a rear-wheel supporting plate.