How does the 7 speed internal geared hub work?

A 7 speed internal geared hub is a type of bicycle transmission that uses a planetary gear system to change gears. It is a self-contained unit that is typically mounted in the rear wheel of the bicycle.

The internal geared hub consists of a number of gears that are arranged around a central sun gear. The sun gear is connected to the drive shaft of the bicycle, and the other gears are connected to the hub of the rear wheel. When the rider changes gears, the sun gear rotates and engages with different gears on the hub, changing the gear ratio of the transmission.

The 7 speed internal geared hub provides a wide range of gears, making it suitable for a variety of riding conditions. The gears are typically spaced evenly, allowing the rider to find the perfect gear for their pedaling cadence and terrain.

Internal geared hubs are also known for their durability and low maintenance requirements. They are enclosed in a sealed housing, which protects the gears from dirt, water, and other contaminants. This makes them ideal for use in wet or dusty conditions.

Here is a more detailed explanation of how a 7 speed internal geared hub works:

1. The rider selects a gear by turning the shift lever on the handlebar.

2. The shift lever actuates a shift mechanism that moves a pawl into engagement with the desired gear on the hub.

3. The pawl rotates the sun gear, which engages with the planetary gears on the hub.

4. The planetary gears rotate the hub and the rear wheel of the bicycle.

The gear ratio of the transmission is determined by the number of teeth on the sun gear and the planetary gears. The higher the number of teeth on the sun gear, the lower the gear ratio. Conversely, the higher the number of teeth on the planetary gears, the higher the gear ratio.

7 speed internal geared hubs are a popular choice for bicycles that are used for commuting, touring, and general recreation. They offer a wide range of gears, durability, and low maintenance requirements, making them a great option for cyclists of all levels.