keep it to 1%. 235/40/18 on a 8 and 8.5 should have the same diameter i believe. i have 235/40/18 on my 18x8.5s for summer and 225/45/17 on my 17x8s for winter
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2018 PB/Black G01 X3M40i | 699M | ZDA | ZPP | ZPX | Maxton front lip | X3M vents | 15mm Spacers | Diamond G20 style grills
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