For now the KDW2 is only availible in 4 sizes, which is very limiting. Fewer sizes = fewer people to use them = less feedback. I'm sure it is a good tire, especially if it is an improvement over the KWD. But the best? I doubt it for a couple reasons. It has been out for a while and there should be some feedback and tests. If it really is the standard, BFG would make it in more sizes. Also, it is not in the highest performance catagory.
