A vehicle configured for conversion between expanded and folded arrangements, comprising: a front wheel having a circumference defining a front vertical longitudinal plane and an axle defining a front vertical transverse plane orthogonal to the front vertical longitudinal plane; a rear wheel rotatably coupled to a rear wheel carrier at a hub of the rear wheel by way of an axle, the rear wheel having a circumference defining a rear vertical longitudinal plane and the axle defining a rear vertical transverse plane orthogonal to the rear vertical longitudinal plane; a main frame member having forward and rearward portions extending between the front wheel and the rear wheel and including, for receiving a steering tube, a head tube formed at a distal end of the forward portion and, for receiving a seat post, a seat tube formed at a distal end of the rearward portion; a hinge coupling provided on the main frame member and enabling relative pivoting of the forward and rearward portions about a main frame pivot axis extending at an acute angle relative to the rear vertical transverse plane and at an acute angle relative to a horizontal plane orthogonal to both the rear vertical longitudinal and rear vertical transverse planes; longitudinal axes of the forward and rearward portions being coincident in the expanded arrangement and non-coincident in the folded arrangement; in the folded arrangement, the front vertical longitudinal plane and the rear vertical longitudinal plane being spaced apart, the front wheel lying substantially alongside the rear wheel carrier and the front wheel overlapping the rear wheel; and characterized by the rear wheel carrier being fixed to the seat tube so as to be stationary relative thereto, wherein the main frame pivot axis lies generally below a center of a cross section of the hinge coupling; and wherein the front vertical longitudinal plane and the rear vertical longitudinal plane are parallel in the folded arrangement. a front wheel having a circumference defining a front vertical longitudinal plane and an axle defining a front vertical transverse plane orthogonal to the front vertical longitudinal plane; a rear wheel rotatably coupled to a rear wheel carrier at a hub of the rear wheel by way of an axle, the rear wheel having a circumference defining a rear vertical longitudinal plane and the axle defining a rear vertical transverse plane orthogonal to the rear vertical longitudinal plane; a main frame member having forward and rearward portions extending between the front wheel and the rear wheel and including, for receiving a steering tube, a head tube formed at a distal end of the forward portion and, for receiving a seat post, a seat tube formed at a distal end of the rearward portion; a hinge coupling provided on the main frame member and enabling relative pivoting of the forward and rearward portions about a main frame pivot axis extending at an acute angle relative to the rear vertical transverse plane and at an acute angle relative to a horizontal plane orthogonal to both the rear vertical longitudinal and rear vertical transverse planes; longitudinal axes of the forward and rearward portions being coincident in the expanded arrangement and non-coincident in the folded arrangement; in the folded arrangement, the front vertical longitudinal plane and the rear vertical longitudinal plane being spaced apart, the front wheel lying substantially alongside the rear wheel carrier and the front wheel overlapping the rear wheel; and characterized by the rear wheel carrier being fixed to the seat tube so as to be stationary relative thereto, wherein the main frame pivot axis lies generally below a center of a cross section of the hinge coupling; and wherein the front vertical longitudinal plane and the rear vertical longitudinal plane are parallel in the folded arrangement.