am looking to get the y design alloys for my 3.0 tdi. i have found two places, the question is the size of the alloy the first place can provide them in 19" 8.5j and 35et and the second place 19" 8.0j but 30et. whats the difference?
The factory Y-design wheels are 19 x 8.5" with an offset of 32ET (as far as I'm aware). Based upon the specifications you mentioned, it sounds like those may not be authentic Audi wheels. Where would you be getting the wheels from?
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You may not notice much of a difference, unless you're looking for it. The 8.0" wheel will be half an inch less wide than the factory 8.5" wide wheel. And the outer position of the wheels will sit 4mm further inward.