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I have had my Armada for over a year now (25K miles), I bought a 20' rims with Goodyear 285/50R. It was a smooth ride but lately I can feel every bump on the road and I can't stand it. I have tried lowing tire pressure but no difference. Any ideas?


BTW, what is the difference in suspension between Infiniti QX56 to Armada?
 

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50 series tire

Those rims and tires are the bulk of your problem. Switching from the 70 series to 50 series with a lot less sidewall flex will make any vehicle ride rougher, especially a truck.
 

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I wouldn't be surprised to find out that you have bent a rim. Low profile (aspect ratio) rubber on those 20's don't leave much of a cushion if you hit a curb, railroad track or pothole.

I went through this with an european sport sedan and had to replace several rims and then found a place that would straighten them but it was pricy - over a hundred bucks a pop. Maybe I'm wrong, but if it was smooth and now is not, check to see if you bent at least one of them.
 
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