2011 ORS § 801.150¹
Bicycle

Bicycle means a vehicle that:

(1) Is designed to be operated on the ground on wheels;

(2) Has a seat or saddle for use of the rider;

(3) Is designed to travel with not more than three wheels in contact with the ground;

(4) Is propelled exclusively by human power; and

(5) Has every wheel more than 14 inches in diameter or two tandem wheels either of which is more than 14 inches in diameter. [1983 c.338 §22]