Actually, the red tie-down strap seen in the photos goes around the rear frame section of the bike, mostly just to hold the machine upright. The rollers are to keep the front wheel on the belt, and the fans direct cooling air across the engine and exhaust.  These were heavy duty devices and could accommodate a Honda CB750, although the concept was as described in the article; to help prospective riders learn how to manipulate the clutch gearshift and brakes in a controlled environment. ... View more