I test fit a set of 18" OEM Audi wheels from my wife's 2011 C6 A6 Avant on my RS6 to potentially use as winter wheels. They require a 25mm spacer to correct for the 48mm offset and fit great in that respect, but there is only about 1mm of clearance between the front brake caliper and the barrel of the wheel. I was able to slide a piece of cereal box cardboard between the wheel and caliper, but it was a tight fit. There is slightly more room at the bottom of the caliper than at the top, but still only 2mm or so. I took it for a short test drive and there was no rubbing, but that seems WAY too close for comfort.
I know the OEM wheels on the RS6 were also 18" and I wondered how close they are to the calipers?
Here are some pics. It's hard to capture how close they are due to the tricky lighting conditions.
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