I don't think this tire will square anywhere near as much as the 140/80-17 K60 does. Squaring doesn't come from the tread pattern as much as it does from the profile of the tire on the rim. The reason that this Big Block tire won't square as much is because not only is it the correct size tire for the rim (150/70-17), but it is a very wide and round profiled tire. This equals less squaring. The problem with the 140/80-17 K60 is that not only is it already a much narrower more square tire than the 150/70-17 Big Block, but it's also too narrow for the F800GS rim. What this does is that when the tire is installed, it's profile gets forced into an even more narrow tall and even more square profile.