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Der Umwerfer schaltet die Kette vorne zwischen den Kettenblättern. Hier erfährst Du, wie ein Umwerfer am Fahrrad funktioniert, welche Bauarten es gibt, wie Du ihn einstellst und warum viele Räder heute ganz ohne Umwerfer auskommen.
What is a derailleur?
A front derailleur is a mechanical bicycle component mounted on the frame or seat post that moves the rear derailleur chain from the front sprocket to another sprocket. The derailleur is operated by a shift cable that is controlled by the bike's shift levers.
The front derailleur is typically connected to two to three chainrings on the front sprocket and allows the rider to switch between different gear ratios to meet the needs of the terrain and type of terrain. The front derailleur moves the rear derailleur chain from one chainring to another by changing the distance between the front derailleur and the sprocket, which switches the chain to the desired chainring.
Derailleurs are usually able to offer a large number of gear ratios, allowing the rider to have a wide range of gears available to suit the needs and demands of their ride. A well-adjusted derailleur can help ensure that shifting between different gears is smooth and precise.
There are several different types of derailleurs, including top-swing derailleurs, down-swing derailleurs, and side-swing derailleurs. Each type of derailleur has its own features and benefits, depending on the type of bike and its use.
What are the advantages and disadvantages of derailleurs?
There are some advantages to using a derailleur on a bike, but there are also some disadvantages. Here are some of the main advantages and disadvantages of derailleurs:
Advantages of derailleurs:
Versatility : A front derailleur allows the rider to switch between different gear ratios to suit the demands of the terrain and their own abilities.
Precise shifting : A well-adjusted front derailleur ensures precise and reliable shifting, which can lead to a better ride and a longer life of the chain and sprockets.
Less effort : Using a front derailleur allows the rider to adjust his gear ratios, reducing the amount of effort required to negotiate different climbs and descents.
Flexibility: Front derailleurs are able to offer a large number of gear positions, giving the rider a wide range of gear ratios.
Disadvantages of derailleurs:
Sensitivity : Due to their design, derailleurs are more sensitive than other parts of the gear system and can be easily damaged if operated accidentally or improperly.
Maintenance : Front derailleurs require regular maintenance and adjustment to ensure optimal performance. An incorrectly adjusted front derailleur can cause problems with shifting and increase wear on the chain and sprockets.
Complexity : The use of a front derailleur on a bicycle increases the complexity of the gear system and can cause cyclists to feel uncomfortable with the operation and maintenance of their gear system.
Potential problems : If a derailleur is poorly adjusted or damaged, it can result in poor performance and even cause the shifting to temporarily lock up, requiring repair.
Sources & References
- Park Tool "Front Derailleur Adjustment". https://www.parktool.com/en-us/blog/repair-help/front-derailleur-adjustment
- Sheldon Brown "Bicycle Glossary: Derailer, Front Derailer". https://www.sheldonbrown.com/gloss_da-o.html
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