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I have a 2004 Denali with 20's wheels and the wheels are 10 inches wide. I do have 285 tires and are a little smaller in diameter than the stock tires.
As for the ride, the ride is a little rougher with 20's but tolerable given that they look so good. One thing I will caution you on is that the handling is compromised by the wider tires. The tires tend to follow the ruts in the road and tend to jerk the vehicle when trying to slow down or stop. Additionally, I aligned the front end after sixth months due to the larger wheels and tires.
The small difference in the diameter of the tires has had no noticable impact on the speedometer readings.
I would recommend that you select a wheel less than 10 inches and likewise a tire that are not as wide which will improve the handling and performance. The wider the tire side wall is the better the ride.
I have gotten used to the slight difference in the ride and handling and am considering purchasing another set so I can decicate a set for winter and summer driving.
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