I just had a set of ST Maxx's installed on my 2015 4Runner on Monday (three days ago). They are 255/80/17. I too was impressed with how quiet they are. Granted, they are louder than the factory "P" rated all-season tires (Dunlop Grandtrek AT20's) but they aren't 'noisy' or loud at all. I could pick out the noise increase, but only because I was specifically listening for it with the radio off. My wife will NEVER notice the difference (using her as a casual, uninterested, non-biased observer).