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Looking for a set of 20" alloys.

Does it matter if I go for 9x20 ET37 or 8.5x20 ET45?

Also, a 255 width tyre has a difference circumference to a 265. Would it make any difference to the handling if the 265 width tyre on a 9x20 rim pushes the wheel out?

Current wheel and tyre on the S6 is OEM 255 40 r19.

This site should help

https://www.willtheyfit.com

Thanks. Main issue is ‘poke’ with face of wheel being 14mm further out on 9” wide rims. not sure what impact moving the centre of the wheel out by 7mm will have on handling. I assume it will understeer more as a consequence?

Is this any use?

20" S6 Rotors on eBay

https://rover.ebay.com/rover/0/0/0?mpre ... 3901768503