You can put up to a 245 tire on those 16s. 55, 50, 45 are the distance (I think in mm, not sure about this though) from the edge of the wheel rim to the tread. 45 being the shortest and 55 the tallest of the three numbers. I went back with the 225/55s on my car but I've also seen the 245s on the 16s as well and they looked really good with the wider stance. The 245 is the width of the tire (across the tread I think again in mm). 245 being a wider tire than a 225. A shorter can mess up the speedo a little but I don't think it'll be a drastic difference. Maybe a few mph. I'm assuming you have the stock Mustang GT 16 inch 5-spoke wheels? I have Dayton Daytona ZR tires and they have worked very well rain/snow/dry.
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FOR SALE: 1996 Mustang GTS: 5-speed, K&N, removed air silencer, 3.73s, turndowns after stock H-pipe (no mufflers), 16 inch Mustang GT wheels; 46,400 miles. $11,500
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