225 is the absolute widest you should go on a 6" wide wheel. You'll want something with a stiff sidewall to help with the sidewall flex too, especially if you went to a 60 series.
Even my 225/55s rub the right side inner fender very slightly at right full lock, but it's not a big deal. Whether or not that happens depends on the car...some will do it, some don't - it's very slight. I'd kind of expect 225/60s to touch, and I'm positive they would on my car.
Jim S. - Pittsburgh, PA
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2011 Ford Fusion SEL - Duratec25/6F35, 31k and counting
2001 Ford Taurus SES - Vulcan/AX4S, 190k and counting
1988 Pontiac Fiero GT - 2.8 V6/Getrag 282
Past: 1993 Taurus GL | 2002 Escort ZX2
Also in the Family: 2010 Fusion Sport | 2001 Toyota Camry LE V6