There aren't many motorcycles that offer a reverse gear (the offbeat Ural sidecar and big honkin' Honda Goldwing being two examples that do), and many are small and light enough that they don't really need one. That said, the heavier a motorcycle is, the more difficult it is to push around. And that's where a new patent from Michelin comes into play.
https://autos.yahoo.com/michelins-ti...140000583.html