I have a Titanium version and the 19" rims. I discovered an annoying vibration at 45 mph and thought it was a bad tire. I took it to a tire shop I trust and they showed me that one of my rims was out of round. (I could actually feel it with my finger while rotating on a spindle.) I had an extra rim from a previous insurance claim. I put that on and the problem went away. I will say, though, that I still feel it really badly on cold mornings or when I haven't driven in a while -- always at about 45 mph. As the tire warms up, it seems to get better. I think the vehicle has a natural frequency, though, that will always be a bit sensitive at 45 mph. I like the look of the 19" rims, but I will never get short aspect ratio tires again. I don't know how folks stand it in those low rider trucks.