ORS 801.194: “Class III all-terrain vehicle” and “Class IV all-terrain vehicle.”

(1) “Class III all-terrain vehicle” means a motorcycle that travels on two tires and that is actually being operated off highway.

      (2) “Class IV all-terrain vehicle” means any motorized vehicle that:

      (a) Travels on four or more tires designed for off-road use only;

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

      (c) Has nonstraddle seating;

      (d) Has a steering wheel for steering control;

      (e) Has a dry weight of 3,500 pounds or less;

      (f) Is 75 inches wide or less at its widest point; and

      (g) Was originally manufactured for off-road use only.