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Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns. On some bicycles there is only one gear and, therefore, the gear ratio is fixed, but most modern bicycles have multiple gears and thus multiple gear ratios. A shifting mechanism allows selection of the appropriate gear ratio for efficiency or comfort under the prevailing circumstances: for example, it may be comfortable to use a high gear when cycling downhill, a medium gear when cycling on a flat road, and a low gear when cycling uphill. Different gear ratios and gear ranges are appropriate for different people and styles of cycling.

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rdf:type
rdfs:label
  • Relació de marxes (ca)
  • Gangschaltung (de)
  • Bicycle gearing (en)
  • Relación de marchas (es)
rdfs:comment
  • La relació de marxes o «relació de canvi» (proporció entre plat i pinyó) es refereix a la velocitat a la qual les cames del ciclista donen voltes en comparació amb la velocitat a la qual giren les rodes. Com les cames dels ciclistes són més eficients en una extensió estreta de velocitats de pedaleig (cadència), una relació de marxes amb l'equipament d'una transmissió variable ajuda al ciclista a mantenir una velocitat de pedaleig òptima mentre circula per terrenys variats. (ca)
  • Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns. On some bicycles there is only one gear and, therefore, the gear ratio is fixed, but most modern bicycles have multiple gears and thus multiple gear ratios. A shifting mechanism allows selection of the appropriate gear ratio for efficiency or comfort under the prevailing circumstances: for example, it may be comfortable to use a high gear when cycling downhill, a medium gear when cycling on a flat road, and a low gear when cycling uphill. Different gear ratios and gear ranges are appropriate for different people and styles of cycling. (en)
  • La relación de marchas o «razón de cambio» (proporción entre plato y piñón), se refiere a la velocidad a la que las piernas del ciclista dan vueltas en comparación con la velocidad a la que giran las ruedas. Como las piernas de los ciclistas son más eficientes en una extensión estrecha de velocidades de pedaleo (cadencia), una relación de marchas con el equipamiento de una transmisión variable ayuda al ciclista a mantener una velocidad de pedaleo óptima mientras circula por terrenos variados. (es)
  • Die Gangschaltung eines Fahrrads besteht aus Schaltvorrichtungen im antriebs- und/oder abtriebsseitgen Getriebe, sowie den zugehörigen Schalt- und Bedienelementen. Mit ihr können bei gegebener Leistung des Radfahrers die Trittfrequenz und das aufzubringende Drehmoment auch bei unterschiedlichen Fahrwiderständen in einen angenehmen Bereich gebracht werden. Bei motorisierten Zweirädern und anderen Kraftfahrzeugen ist im Unterschied zu Fahrrädern in der Regel nur das antriebsseitige Getriebe schaltbar ausgeführt, während am Achsgetriebe meist keine Schaltbarkeit vorliegt. (de)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/Shimano_xt_rear_derailleur.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/2009-07-26-berlin-by-RalfR-99.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Rohloff-nabe.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/SRAM_Dual_Drive.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/2010_Cervelo_RS_02.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Half-step_plus_granny_crankset_on_a_Trek_620_Touring_Bicycle.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Pinion_P1.18_mounted.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Singlespeed-mountainbike.jpg
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