18" rim width advice with 6 pot Forge or Porsche calipers on S3 8L?

Big Al

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I'm looking to buy a set of 4* 18" Rota Drift series rims -either the 9.5" ET23 Grid, 9" ET35 G Force or 8.5" ET35 Grid

Would like to fit 6 pot front Forge or Porsche calipers (18Z) with either 330 or 356mm rotors , so am wondering which is the widest rim I can fit, ideally without rolling the arches. On the rear I shall keep the standard calipers. Car is lowered on coilovers. Recommended adapter sizes? Tyre sizes?

Many thanks in advance.

Alistair
 
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