Q: 2006 Carrera S Wheel Offsets
Just to clarify, adding spacers brings the wheel out. Both are correct.
BUT, the 67 ET is already flush. Adding 15mm to it puts is OUT another 15mm to a total of 82 ET and no longer flush but sticking outside the body. 15mm is needed on the 51 ET to make it flush.
I'm also not putting spacers on one side, that's silly. I'll match the wheels swapping one to make a pair and then adjust offsets as needed with spacers as a pair. Which wheel goes and which stays is the discussion.
As OP, I compeletely agree and am doing just that. Step one match left and right. Step two adjust offset to get the aggressive look to my taste. If I can achive both without spacers then even better.
Wheel condition matters too. Why would I keep a curbed wheel when matching left to right? This particular vehicle is not in mint condition. But it has not been abused either. There is minor curb rash to deal with, nothing obvious, but its there.
BUT, the 67 ET is already flush. Adding 15mm to it puts is OUT another 15mm to a total of 82 ET and no longer flush but sticking outside the body. 15mm is needed on the 51 ET to make it flush.
I'm also not putting spacers on one side, that's silly. I'll match the wheels swapping one to make a pair and then adjust offsets as needed with spacers as a pair. Which wheel goes and which stays is the discussion.
As OP, I compeletely agree and am doing just that. Step one match left and right. Step two adjust offset to get the aggressive look to my taste. If I can achive both without spacers then even better.
Wheel condition matters too. Why would I keep a curbed wheel when matching left to right? This particular vehicle is not in mint condition. But it has not been abused either. There is minor curb rash to deal with, nothing obvious, but its there.
I think offset is confusing you. With a narrow body if you have one rear wheel with an et of 67mm and other rear wheel with an et of 51mm (both wheels no spacers), the 51 wheel will not be inside - it's the other way. Since 67mm is the standard for a narrow body and 51mm is the standard for a wide body, the 51mm on a narrow body would push it out certainly further out than the 67mm wheel. There's a good explanation of offset at www.1010tires.com
Yup, messed up the offset calcs. 
I've fixed my original posts so as not to confuse people who read this later. A larger offset wheel sits more inside the car. Adding spacers pushes it out, LOWERING the offset.

I've fixed my original posts so as not to confuse people who read this later. A larger offset wheel sits more inside the car. Adding spacers pushes it out, LOWERING the offset.
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