Hello,

Need some help with a 2009 CLS 63 with semi-active air suspenson.

Has anyone fitted 21" wheels and lowering module on this car yet?

Yep! I had 21'' Lowenharts with my lowering module. when the module was set to the lowest setting, the wheels rubbed when going over dips etc.

I sold them and went down a size to 20". I usually don't drive on the lowest setting, but if I do, no problems and no rubbing.

I thought those were 21's??

Went back down to 20" More tire options out there with 20. And, I also get to go with the 11'' wide in the rear.