Park Tool

Dummy Hub

A Dummy Hub is a tool that replaces the rear wheel of your bicycle, allowing you to clean the chain and transport your bike without removing the rear derailleur or chain. This makes maintenance easier and more efficient, especially for those who frequently clean or repair their bikes.

The rear derailleur is a crucial component of your bike's gear system. It shifts the chain between different gears on the rear cassette, enabling smooth gear changes. Understanding its function is essential for effective bike maintenance and ensuring optimal performance while riding.

A 1/8-inch chain refers to the width of the chain, commonly used in single-speed bikes and some BMX bikes. This measurement is important for compatibility with your bike's components. If you have a single-speed or BMX bike, using a 1/8-inch chain is essential for proper function and performance.

Open dropouts are the slots on a bike frame that secure the rear wheel without additional hardware. They differ from thru-axles, which provide a more stable connection. Understanding open dropouts is important for bike assembly and maintenance, especially if you're upgrading or replacing components.

A 12mm thru-axle is a type of axle that secures the rear wheel to the bike frame, offering a more stable connection than traditional quick-release systems. This is particularly beneficial for mountain bikes and high-performance road bikes, as it enhances stability and performance during rides.

While Dummy Hubs are versatile, they are primarily designed for bikes with standard rear derailleur systems. It's important to check compatibility with your specific bike model to ensure proper fit and functionality during maintenance tasks.