I just put a set of Dueler H/P on my Denali, and they are a very good set. Good on the road, and off the road as well as on bad road conditions.
Are these runflats on the X5M?

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2011 ///X5 M (On Order)

2009 X5 4.8 M Sport Space Gray/Black Fully Loaded

2007 GMC Yukon XL Denali Loaded and Customised