I've got 20mm in the rear with sport package 162's. Looks great, but because my tires (Yokohama S-Drive) are 'beefier' on the sides than most, I slightly rub in the fender liner over big bumps. I'd venture to say that with 90% of tires out there you could go 20mm without rubbing - you sure wont rub on the actual fender.
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