Im running 275/305 and I have had no problems. I ran the new Hankooks in those sizes on my stock Rays for about two months until I got my new wheels. I went with slightly wider wheels when I bought my TSW's, going to 9.5/10.5 which made the tires look even better, IMHO. Like I said earlier, I am running 15mm/20mm spacers as well and ran them on the stock Rays. You will have no issues at all unless you slam your car. I have not had a chance to lower mine yet and may not do so due to the local roads. I scrape a lot already.
AZ
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AZ Roadster
'09 Base|Chicane Yellow|TSW Nurburgrings|Stillen CBE|Eclipse AVN726E In Dash DVD/NAV|Clear Bra|H&R Spacers 15/20|Hankook Ventus V-12's 275/35 & 305/30
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