Convertible running shoes/roller skates

A convertible roller skate comprising:

• footwear including a sole plate having a heel portion, a toe portion hinged to the heel portion for permitting normal flexure of the sole plate during walking or running by a user, and a pivot pin extending downwardly from said heel portion at a central portion of said sole plate;
• a disk plate including a toe retention channel for receiving the toe portion of said sole plate, a pivot pin seat for rotatably receiving said pivot pin, means for removably locking said sole plate to said disk plate at selected angles of rotation about said pivot pin, and a plurality of truncated conical disks rotatably attached to the lower surface of said disk plate along two longitudinally extending rows, each row of disks comprising a plurality of front disks having an axis of rotation extending inwardly and downwardly with respect to a vertical plane intersecting the center line of said disk plate and a plurality of rear disks having an axis of rotation extending inwardly and upwardly with respect to said vertical plane;
• and
• a flexible tread plate including means for removably securing said tread plate to said sole plate, wherein said tread plate may be secured to the sole plate of said footwear for use as a conventional shoe or said disk plate may be secured to the sole plate of said footwear for use as a roller skate.