Hi
I have xDrive xLine 20d fitted with 18" wheels and standard Bridgestone Turanza 255/50 tyres. I also have the electronic damper option which I was led to believe was operational in Comfort mode. In any event I do not find the "ride quality terrible." It is firmish but very acceptable. Maybe it is the runflats ... or more likely a very bad road surface! Also read quite a few comments regarding wind noise but again I do not find it a problem. Generally very pleased with car...especially performance and auto gearbox. Only criticism are the rather hard leather seats! Have ordered Posture Cushion for £26 and will see if that helps.
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