Oregon Revised Statutes Oregon Vehicle Code § 801.190

(1) Is 50 inches or less in width;

(2) Has a dry weight of 1,200 pounds or less;

(3) Travels on three or more pneumatic tires that are six inches or more in width and that are designed for use on wheels with a rim diameter of 14 inches or less;

(4) Uses handlebars for steering;

(5) Has a seat designed to be straddled for the operator; and

(6) Is designed for or capable of cross-country travel on or immediately over land, water, sand, snow, ice, marsh, swampland or other natural terrain.