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In the classical literature, tall, skinny wheels have the lowest rolling resistance. Wide tires are bad for air drag, but the radial-belted construction may have changed the traditional advice. Unfortunately, the data is proprietary information, so about all we can do is look up the LRR tires, such as the Bridgestone Potenza RE92 and choose light wheels to suit them. Larger overall diameter will change the speed and mileage readings, but also reduce engine RPM, which usually helps.
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There is no excuse for a land vehicle to weigh more than its average payload.
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