Just for the record, my experience as related above is with radial slicks. I get the impression that most of the time when using the term, "drag radials", folks are referring to ET Street radials, or another version of a street/strip radial. A true radial slick is a totally different beast and is still picky about track prep in comparison to a bias ply slick, at least in my limited experience. Quick time pros were more consistent for me than the true radial slick.