If you drive a 2009 BMW X5 xDrive30i with an O.E. size of 255/55-18, then you might be interested in these best-selling X5 Tires:
Bridgestone Dueler H/L 400 RFT
Continental CrossContact UHP SSR
Michelin Latitude Tour HP
Michelin Latitude Tour HP ZP
We tested the Latitude Tour HP with a few other tires well-suited to crossover vehicles and refined SUVs. It performed fairly well in comparison, which you can read about in our test results.
To see more X5 tires, search by your vehicle's make, model and year or tire size.