Wheeled board apparatus having platform with concave sidecuts

A wheeled board apparatus, comprising:

• a platform defining a top standing surface and a bottom surface, said bottom surface bearing at least two primary wheels having their rolling surfaces disposed in line along a central longitudinal axis of said platform;
• said platform having a first edge provided axially displaced on one side of said central longitudinal axis, said platform further having a second edge provided axially displaced on a second side of said central longitudinal axis opposite to said first edge, said first and second edges respectively defining first and second concave portions respectively having first and second sidecuts (d);
• a first set of at least three outrigger wheels mounted along said first edge, said first set of outrigger wheels having rolling surfaces generally following said first concave portion;
• and
• a second set of at least three outrigger wheels mounted along said second edge, said second set of outrigger wheels having rolling surfaces generally following said second concave portion.