Some Canadian retailers are selling Diablo R IVs now in most common sizes, but not 190/50R17. I haven't found any US retailers selling it either, in fact, but Pirelli does list it as a size that it is available in - is there a chance that anybody knows what's going on? Or even know who would know? Answers I have gotten so far aren't helpful. I'd like to get a set of these, but if it's something like supply chain blah blah not available this year then I will settle for something else.