The first number is your width in millimeters (215). The second number is a percentage of the first number, which determines how big your sidewall is (65 or 65% of 215 which is roughly 140mm). The third number is your rim size.
But back to your original question, the widest I was able to talk Discount Tire into putting on my car was a 235. I went with 235/60/16 to keep the sidewall as close as possible, but they're a tiny bit bigger, not to the point of being noticeable.
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