I have an '09 E550 with the AMG Sport Package. Can anyone tell me the specs of the wheels, namely offset? Thank you.

Pretty sure generally the 211 E's are about 37et for offset.

There are many threads on the topic, and although I don't have my manual handy to quote the OEM spec, this table has the information: http://www.wheelfitment.net/mercedes and this handy tool tells you all about wheel / tire fitment: http://www.rimsntires.com/specspro.jsp

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Here's what the manual states.