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<td valign="top">When riding on a smooth surface, rolling resistance does decrease theoretically with any increase in pressure, but with modern, high-quality tires the rolling resistance at correct inflation pressure is already so low that the infinitesimal reductions gained are more than outweighed by the trade-offs.</td><td valign="top"></td></tr><tr><td valign="top">In practice, riding surfaces aren't perfectly smooth, and overinflation actually increases rolling resistance, due to vibration.<br><br>Radial plies let the tread lie down flat without scrubbing. This is why radial-ply car tires wear longer. As already described, though, radial-ply tires have less lateral stability than bias-ply tires. Also, as Jobst Brandt has pointed out, a large-diameter, small cross-section bicycle tire has much less scrub than a car tire.<br><br>A belt under the tread also helps the tread to lie down flat without scrubbing, and increases lateral stability by distributing lateral forces lengthwise along the tread -- but is not applicable to narrow tires which must lean when cornering.</td><td valign="top">In der Praxis ist die Fahrbahn nie perfekt glatt. Wülste und Vibrationen erzeugen Rollwiderstand. </td>