R3 is not a real world term. It is just how PD ranks their generic tires. I dont know a lot about tires, but those are not the highest level of racing tires available (which would be R3 in GT). According to the tires that sit below them on the rack, thay are all street tires. They may have an R and a 3 in the title of the specific tire, but they do not correspond to R3 tires in GT.