According to the study Wheel Energy, the key to reduce roll resistance (rolling resistance) is to minimize the energy lost due to casing deformation, instead of minimizing the surface area of the tire that touches the ground.
How efficient? For the same model and brand, will have a 25mm wide tire roll resistance 5% smaller than 23 mm tires. But of course the 23mm tires and a more streamlined has the advantage of aerodynamics and lighter.
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