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We stepped up to a set of Nitto Extreme NT555 tires for Project RSC-275/40/18s for the front and slightly larger 285/35/18s out back. Despite the thinner sidewall, the ride quality of the Nittos was much better than our original 17s. Fresh from Ford Racing came these 18x9.5 Cobra R wheels. We liked the looks, but more importantly, the OEM quality (complete with full factory testing) and fit.