I'm using 15 in front, 20 in the rear. I think that is pretty much a standard.
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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