Going with a wider tire means more contact patch which improves stopping and latteral grip, but if you too wide for a given rim, the handeling get's mushy from the sidewall rolling over and grip can actually be worse. I agree with Matt. In most cases 235 on a 7.5" rim would be ideal (as long as it doesn't rub). Some 245 wide tires might offer more grip, but possibly at the cost of spongy handleing and you wouldn't like the way it looks.
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