My 2009 X5 will need new tires shortly (255/55R18RF). Trying to decide between the current tires (Bridgestone Dueler 400) or upgrade to the Michelin Tour HP ZP at +$100/tire or $400 for the set. I don't mind the extra cost (well maybe a little) but my primary usage is around town, occasional freeway and never track/mountain roads. So noise, handling, wear, in that order. Need to stay with RunFlats.The Continental Extreme Contact DWS is among the best available for winter traction, however it is not available in a run flat tire. If you have the 255/50R19 size, the best available run flat all season would be the Michelin Latitude Tour HP ZP.