[PIR3lly]

By filling in the wheel values from felgenkatalog.auto-treff.com in to the wheel calculator and reading the results on the bottom of the page. But like I said, compared to stock 19"

And I didn't look at the tire, only rim. Depending on tire size, that might stick out more or less than the rim itself.

The numbers you posted are wrong. You can't only look at et, but you also have to look at rim width. Compared to stock you go from 8,5J to 9J in the front and 9J to 10J in the back. That makes them stick out more than just the et difference.