Indiana Code Title 9. Motor Vehicles § 9-13-2-104.1

(1) has a seat or saddle for the use of the rider;

(2) is designated to travel on not more than three (3) wheels in contact with the ground;

(3) complies with the applicable motor vehicle equipment requirements under IC 9-19 and 49 CFR 571;

(4) has a cylinder capacity not exceeding fifty (50) cubic centimeters;  and

(5) is registered as a motor driven cycle under IC 9-18.1.