I understand that some people are running 130/80 size dual sport rear tires in front. I'm entertaining doing the same thing with a set of Shinko 705s. I noticed though that the 705 comes in a 120/90. While this tire has a higher profile, it's actually not as tall as the 130/80 and matches the stock tire in width. Only snag is that it's a tube tire where the 130/80 is tubeless. Is this an issue?