I would go 20mm to keep it simple but I'm worried there will be too poke with 9x20's with 255/35's. 10mm is probably perfect and 15mm at a push.
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor  )
1988 E30 Coupe - Royalblau Metallic
2003 S4 Avant - Light Silver Mettalic
2016 S5 Coupe Black Edition - Ibis White
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