The wheel offset is marked on German wheels. Unfortunately I seldom use it so I can't tell you where.

I went to the link listed and there is a statement on the page I find interesting:

"The clearance from stut housing to the inside of the wheel will be THE SAME
The outside edge of the wheel will EXTEND an extra 26mm."

What he is doing in that statement is garbage. He is telling someone how to buy bigger wheels that will offer similar inside clearance. In the statement above he has gone from a 7in wheel to an 8in. He has used a different offset such that all the width change is placed at the outside of a rim.

If you look at the spec book there is a proper offset for every suspension design. If you buy bigger rims the the offset must stay the same or you screw the design. The quickest way to defeat the suspension designer is to change the offset

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician