Just put a new pr4gt on the back of my 2009 rt ( still got a pr3 on the front). As soon as I left the dealer's the heavens opened in a deluge of biblical proportions. Nary a squirm or a skitter - gotta love those michelins. The only difference I could tell over the old pr3 was that everything just felt a bit more taut - but new tires always do that anyway. Certainly no concern about harsh ride, one up with no luggage.