Tires: cupping on edges, cupping, misalignment


Question
I have 4 285-60-17 tires on my Durango and they have about 6000 miles on them and they are cupping real bad. What is the problem? thank you.

Answer
Paul,

You didn't tell me what model of Durango, but there are versions that have 7" wide rims and a P285/60R17 requires a minimum of a 7 1/2" rim.  While this will aggravbte the situation, the main cause of cupping wear is misalignment.  With such a wide tire, the alignment needs to be nearly perfect!