Expander Tube Brake

An expander tube brake, also known as a mechanical expander brake or a tube expander brake, is a type of braking system used in some bicycles. It is a mechanical device that applies friction to the inside of the bicycle's rim to slow down or stop the rotation of the wheel.

The expander tube brake consists of a metal tube that is mounted on the bicycle frame or fork. Inside the tube, there is a rubber or synthetic brake pad that is pressed against the rim when the brake lever is squeezed. The brake lever is connected to a cable, which pulls on the brake pad and causes it to expand and make contact with the rim.

When the brake lever is squeezed, the cable pulls on the brake pad, causing it to expand and create friction against the rim. This friction slows down the rotation of the wheel and brings the bicycle to a stop.

Expander tube brakes are commonly found on older bicycles and are known for their simplicity and reliability. However, they are not as powerful or efficient as other types of braking systems, such as disc brakes or caliper brakes. Therefore, they are less commonly used on modern bicycles.

It's important to note that expander tube brakes require regular maintenance and adjustment to ensure proper braking performance. The brake pads may wear out over time and need to be replaced, and the cable tension may need to be adjusted to maintain optimal braking power.

Overall, expander tube brakes provide a basic braking solution for bicycles, but they may not be suitable for high-performance or demanding riding conditions.