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A bigger-diameter tire may improve fuel economy under certain circumstances, yet the weight might become an issue. But usually, a narrower tread may sort of compensate that. And the weight of the vehicle increasing the pressure between the tire tread and the pavement may not be so bad when it comes to grip. Just look at how some snow tires are noticeably narrower than all-weather tires. I remember seeing charts mentioning snow tires with a 135 tread being suitable to cars which often resort to 185 or 205 treads on all-season tires.
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