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As with anything there are diminishing returns. At some point weight and lack of aero will overcome LRR. However, most road racing wheels were 19mm wide and now they are 22-25mm. Cars which as a total line have to meet mpg standards, will now more likely have 55 or 60 series tires on them rather than the old standard of 75 series. Good suspension work can hide most of the tire from the headwind,leaving the aero part of the equation a moot point.
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