I am adealer and have raced since 1994. I have always ran the holeshot tires.......until now. I didn't want to "guinia pig" a set of these tires.so iwaited.and waited.and finally got tired of it and just bought me a set for my Z. WOW. They are as light as the stock tires but are 6 ply. They hook up as good as the holeshots. You guys have gotta try them. If you are interested in a set e-mail me.HIGHLY RECOMMEND.