From googling and trolling other forums, it seems to be an upgrade for higher horsepower/open class bikes. I can only guess that is because they have the power to spin up the rear tire. I'm honestly not sure how I feel about it. In a lot of ways I really don't care either way. On one hand I don't like it being one more thing that guys have to spend money on, but on the other hand if it makes a tire last longer and reduces need/want for bazzaz traction control type units, then isn't it paying for itself?