I took off my 20" Run Flat Bridgestones at 10,500 miles and swaped them for a set of Michelin Latitude Tour HP's. I ordered the Space Saver Spare on mine because I knew I would dump the Run Flats. Even without a spare, I would dump the Run Flats. The Run Flats on the Front were not even half worn. The outside edge of the fronts were a little worn, but not Bald. I drive Canyons every day, and believe me, I do not baby the X5. I plan on putting the Run Flats back on at the end of my lease. My ride has improved and handling is the same with the New Tires. I bet your alignment may be off. I had the Dealer do a free alignment at 1800 Miles. My SA is cool, so he just did it. Was not off much at all. I Bought a Lifetime Alignment for mine on sale for $149.00. Shop has the same Hunter Machine as the Dealer. I can go have it checked whenever I want to.