The ET-R is the street legal version of this tire. The Pro isn’t legal (bfd). Both are good for dry street use. Both would be dangerous in the rain. I have experience with both and the Radial Pro has a different (softer) rubber compound for racing. This is the tire that most of the 7 and 8 second Hellcats use. It’s as good as they get for heavy cars It’s too big to qualify for what is called small tire in sanctions that have that catagory.