I have a 2007 X5 Diesel without Adaptive Drive/Sports Suspension....when driving at low speeds a distinctive "ticking" type sound can be heard and it appears to be coming from rear suspension / wheels... You can only hear it with windows open and when driving in a garage or near a building... it's a sound almost like a thin metal strip is attached to the tire..as it is repetitive and definitely related to wheel rotation as it is quicker at higher speeds..Anyone experience anything similar .. mentioned it al last service... and they said they could find nothing...