Physik
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<div class="editbutton" style="text-align:left; ">[[Reifenbreite und Rollwiderstand#oben|« zurück nach oben »]]<br></div> | <div class="editbutton" style="text-align:left; ">[[Reifenbreite und Rollwiderstand#oben|« zurück nach oben »]]<br></div> | ||
===Grundlagen=== | ===Grundlagen=== | ||
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===Christian Smolik<small><ref>[http://www.smolik-velotech.de/glossar/r_ROLLWIDERSTAND.htm Smolik Velotech]: ROLLWIDERSTAND</ref></small>=== | ===Christian Smolik<small><ref>[http://www.smolik-velotech.de/glossar/r_ROLLWIDERSTAND.htm Smolik Velotech]: ROLLWIDERSTAND</ref></small>=== | ||
''Der Rollwiderstand sinkt mit steigendem Luftdruck, da er den Reifenwulst [...] verkleinert'' | ''Der Rollwiderstand sinkt mit steigendem Luftdruck, da er den Reifenwulst [...] verkleinert'' | ||
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− | + | There are four ways to reduce this friction, each subject to trade-offs: | |
# The thinner and softer the rubber/fabric of the tire are, the more flexible they become. | # The thinner and softer the rubber/fabric of the tire are, the more flexible they become. | ||
# The trade-off with this is that the thinner the tire gets, the more fragile it is, and the sooner it will wear out. The higher the air pressure, the less the tire will deflect. | # The trade-off with this is that the thinner the tire gets, the more fragile it is, and the sooner it will wear out. The higher the air pressure, the less the tire will deflect. | ||
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# 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. | # 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. | ||
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− | <td valign="top"> | + | <td valign="top">Es gibt 4 Wege, die Reibung zu vermindern, jeder bedeutet Kompromisse: |
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− | <td valign="top"> | + | <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> |
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− | <td valign="top"> | + | <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> |
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