The reason is the first part of the tire size is the width. You have 205 front and 225 rear. The second number that appears is the (/55 or /50) is the side wall height. The side wall height number is acutally a ratio of the width of your tire. So in order to keep the over all height the same they had to use a 50 series tire in back because it was wider than the front. So the front they used 55 series.
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