The Shimano ALFINE DH-S501 hub dynamo is a high-quality hub specifically designed for use with disc brakes in the Center-Lock system. With a power output of 6 volts and 3 watts, this dynamo provides a reliable energy source for lighting systems and other electrical components on bicycles. The dynamo has an axle diameter of 32 millimeters and is equipped with 32 holes, ensuring high stability and durability. The hub type is classified as a hub dynamo, meaning it integrates energy generation directly within the hub. The axle standard is designed for quick release, allowing for easy installation and removal. The silver color gives the product a modern and appealing look that fits well with various bicycle designs. The ALFINE DH-S501 is ideal for cyclists who value efficient and reliable power supply without compromising on the benefits of a lightweight and compact design.