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Message: <blockquote data-quote="SwollenRaccoon" data-source="post: 1450336" data-attributes="member: 19178">This has been discussed before, with as many opinions as there are members.  MY two cents...aerodynamics.  Top box on and a pillion along, zero vagueness. Top box on and an empty rear seat, occasional but not severe or frightening "wandering".  It has to be aerodynamic, barring steering head or tire/frame issues, since the problem goes away with a passenger, which would actually lighten the front tire load. When I have some luggage on the rear seat, the problem is less noticeable than when the seat is empty. The top box, with an empty pillion seat, seems to act just like a wing on a race care, adding downforce (more likely "drag" than downforce) to the back of the bike, and lightening the front, more so even than adding a passenger to the back. I have been into triple digits many times with the top box on, and felt it many times, but it never felt dangerous.   Remember, this is just my opinion, which is worthless.  Ride the bastard, and ride it hard.</blockquote>