I've just been reading on thefashionlaw dot com about Harley Davidson suing a company called Urban Outfitters for copyright infringement in January 2017.
On there it states '' In addition to federal trademark protections for its full name and various logos, Harley-Davidson has several federally registered trademarks that extent (sic) to the word, โHarley,โ on its own ''.
So I would assume that it is indeed down to the use of the word Harley as that is a trademark of Harley-Davidson. That doesn't explain of course why the segways were removed.