(a) "Bicycle" means every device, other than a device that is designed solely for use as a play vehicle by a child, that is propelled solely by human power, upon which a person may ride and that has two or more wheels any of which is more than fourteen inches in diameter.
(ORC 4511.01(G))
(b) "Motorized bicycle" means any vehicle having either two tandem wheels or one wheel in the front and two wheels in the rear, that is capable of being pedaled and is equipped with a helper motor of not more than fifty cubic centimeters piston displacement which produces no more than one brake horsepower and is capable of propelling the vehicle at a speed of no greater than twenty miles per hour on a level surface. (ORC 4511.01(H))