I am about to pull the trigger on a 2008 CLS 320 CDI. It comes with the AMG 19" wheels, which are reputed to be made from cheese and will crack or bend at a mere sniff of a sharp ridge, let alone a UK pothole. I hear that 18" wheels are a good compromise. The car has airmatic. I have checked the sticky about wheels and tyre sizes. Problem is there seem to be 4 offsets specified for this car, [/url] Most are around 28-30mm, two are 18-20. So what to go for?