Navväxlar

Navväxlar, also known as hub gears or internal-gear hubs, are a type of bicycle gearing system where the gear-changing mechanism is enclosed within the rear wheel hub. This design offers several advantages over traditional derailleur systems. The internal gears are protected from dirt, moisture, and impacts, leading to lower maintenance requirements and increased durability. They are also less prone to damage from falls or collisions.

The operation of a navväxlar involves a planetary gear set or a similar mechanism within the hub. By manipulating a control lever or grip shift connected by a cable to the hub, the rider can engage different gear ratios. This allows for smooth gear changes, even when the bicycle is stationary, which is particularly useful in stop-and-go urban cycling.

Navväxlar typically offer a range of gear options, from a few basic ratios to more complex systems with many speeds, comparable to or even exceeding the range of some derailleur systems. However, they can be heavier and more expensive than comparable derailleur systems. The internal mechanism can also introduce slightly more friction, leading to a minor loss of pedaling efficiency. Despite these potential drawbacks, the simplicity, robustness, and low maintenance of navväxlar make them a popular choice for commuters, touring cyclists, and those seeking a reliable and hassle-free cycling experience.