Lisähammaspyörä

Lisähammaspyörä, also known as an auxiliary gear or overdrive, is a mechanical component used in bicycles to provide additional gear ratios. It is typically mounted on the rear wheel and engages with the chainring on the crankset. The primary purpose of a lisähammaspyörä is to allow cyclists to travel at higher speeds without pedaling as fast, which can be beneficial for long-distance riding or climbing steep hills.

There are two main types of lisähammaspyörä: internal and external. Internal lisähammaspyöräs are integrated into the hub of the rear wheel, while external lisähammaspyöräs are separate components that attach to the wheel. Internal lisähammaspyöräs are generally more compact and lightweight, making them popular for road and gravel bikes. External lisähammaspyöräs, on the other hand, offer more flexibility in terms of gear ratios and can be used with a wider range of wheel sizes.

The use of a lisähammaspyörä can significantly improve a cyclist's efficiency and comfort, especially on long rides or when tackling challenging terrain. However, it is important to note that using a lisähammaspyörä may require some adjustment to riding technique and may not be suitable for all types of cycling or riding conditions. Additionally, the installation and maintenance of a lisähammaspyörä can be more complex than that of a standard bicycle drivetrain.