N.D. Cent. Code § 39-27-03: Frame-chassis requirements

1.The motorcycle frame-chassis, including the suspension components and engine mountings, must be of substantial construction, capable of supporting the combined weight of all vehicle components and riders for which the vehicle is designed, and withstand normal road shocks and operational stresses without constituting a hazard to the riders or other users of the highway.

2.The wheelbase may not be less than forty inches [101.6 centimeters].