D3 S8 tyre sizes (2006 model)
Hi Guys,
I read this rather late but investigated when I bought my winter tyres (18" rims).
The standard wheel for my car (d3, 2006 S8) is 20"*9", 10 spoke. The standard tyre is 265*35*20.
The factory fitted spare is 18"*8 with (fat) 5 spokes, sprayed gloss black with one of those horrible yellow stickers limiting you to 50 mph. The factory fitted tyre is 255*45*18. In my case, the wheel had never been removed from the wheel well (still shiny) and the tyre still had the rubber sprules sticking out, also unused.
When I bought my winter wheels, I bought 18"*7.5" also 10 spoke pattern match to the 20" originals. I fitted 235*50*18 winter tyres which are very similar in rolling radius (dunlop winter sport d3).
Hope that helps
Richardracer
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 2006 Audi S8 V10 Now Sold.  Akoya Silver with black/grey leather, standard 20" wheels, hybrid TV, Bang & Olufssen audio, Heated seats front and rear, Dension ipod integration, DAB radio, keyless entry, rear electric blind, bluetooth connection to Apple iphone6S. Started at 60,000 miles end April 12. Now 171,500 miles as at Oct 2017. Now sold to fellow forum member.
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