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I just saw you on bimmerfest. Your wife gets nauseated riding in the X5 right?Fully loaded short bus denali
Here is my take..
Set-Up is Max Trailering Package, 275/55/20 Continentals, Auto-ride
I went thru the ride issue where I felt a vibration when going above 65 and in some instances.. suspension felt out of whack even at low speeds if hit even the slightest imperfection in the road.. this was AFTER.. I went to the dealer for an Oil Change and Tire Rotation where they also added air to my tires.. 35psi.. which is the recommended. I then commenced in dropping them back to where I was before I took it in.. 33PSI all around and the vehicle rides as smooth as a Caddy now. No vibration, not roughness.
so basically, you notice a big difference in ride when tires are 35+psi vs 33psi or less?