I'm currently at my volvo dealership getting my R looked at to see if there is somthing wrong with my suspension/struts that would be causing the inside of my rear tires to cup. My tires have 17k miles on them and have been properly maintained with rotation and tire pressure their whole life. If suspension if fine and everything else I am at a loss. My question is what is the possible correlation of side-hop and cupping of tires? It's to the point where every person that has been in the car with me has asked why my car moves like that. It becomes a bit scary when speed limits are at 70mph and hitting bumps. Three dealerships now and all three haven't heard of this problem.