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The ad says OEM Cayman wheels. Here are the standard offsets for 987S (18")
Stock 2006 Boxster S wheels.
Front Rim: 8 J x 18 H2 offset: 57 mm
Rear Rim: 9 J x 18 H2 offset: 43 mm
The ad said 46mm offset for 9.5 wheel (rear)
With 12.5 mm more total width, the backspacing will be 3mm more than stock 987 wheel above.
My OZ wheels have 10mm more backspace on the rear and 8mm more on the front and still have PLENTY of clearance.
Again, you are dealing with 986 rather than 987 so I don't know what you need for offset and backspace.
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Sold - Black on Sand Beige 2006 S - 48K miles
18x8.5 and 10 OZ Alleggerita HLT Anthracite wheels and anthracite Cayman side grilles - lovingly adjusted Schnell Short Shift
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