Abstract: A cargo adaptor for a motorcycle includes a support arm configured to attach to at least one standardized frame component of the motorcycle, a crossbeam extending from the support arm, and a rack mounting point disposed on the crossbeam. The rack mounting point is configured to support a rack along a longitudinal centerline of the motorcycle above the rear suspension thereof while the motorcycle is operated under normal driving conditions. A cargo system for a motorcycle including the cargo adaptor further includes a cargo rack attached to the mounting point, wherein the orientation of the cargo rack evenly distributes the weight of the system and any cargo contained therein such that the motorcycle may be operated in a normal manner. A method for removably attaching the cargo system to existing frame elements of the motorcycle is also described herein.