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2. Derailleur - Wikipedia

   en.wikipedia.org/wiki/Derailleur

   The rear derailleur has two functions: it moves the chain between rear sprockets while taking up chain slack caused by moving to a smaller sprocket at the rear or a smaller chainring by the front derailleur. In order to accomplish this second task, it is positioned in the path of the bottom, slack portion of chain. Sometimes the rear ...

3. Bicycle drivetrain systems - Wikipedia

   en.wikipedia.org/wiki/Bicycle_drivetrain_systems

   A chain drive and rear derailleur gear change, the most popular system in use today A shaft-drive with crankset and rear gear hub. Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels.

4. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Derailleur cage: the part of the Rear derailleur that holds the Pulley wheels; Quick release dropout: a piece on the rear dropout that the derailleur attaches to. Down tube: tube on the bicycle frame that runs from the head tube to the bottom bracket

5. Fork end - Wikipedia

   en.wikipedia.org/wiki/Fork_end

   The disadvantage is that on a bicycle without a rear derailleur but with vertical dropouts, the chain tension cannot be adjusted by moving the wheel forwards or backwards, and needs another means of chain-tensioning, by a derailleur, chain tensioner, or eccentric bottom bracket or rear hub. Fixed wheel bicycles cannot use any form of chain ...

6. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   On a bicycle with more than one gear change mechanism (e.g. front and rear derailleur), these three numbers can be quite different, depending on the relative gearing steps of the various mechanisms. The number of gears for such a derailleur equipped bike is often stated simplistically, particularly in advertising, and this may be misleading.

7. Bicycle parking rack - Wikipedia

   en.wikipedia.org/wiki/Bicycle_parking_rack

   Although the primary use for a bicycle stand is for parking, it is useful at times to use it for maintenance and adjustments. While it is difficult to spin a rear wheel while making derailleur adjustments, if a stand were high enough to support the rear of the bike by the saddle nose, then this problem could be solved.