Braze-on

A braze-on is a fitting, typically made of metal, that is permanently attached to a bicycle frame or component using brazing. Brazing is a metal-joining process where a filler metal is heated above its melting point and distributed between two or more close-fitting parts by capillary action. This filler metal, also known as braze, has a lower melting point than the adjoining metal. The braze-on provides a standardized and secure mounting point for accessories, cables, or other components.

Compared to clamping or adhesives, braze-ons offer a more permanent and robust solution for attaching items to a bicycle frame. They allow for precise placement and eliminate the risk of slippage or movement associated with other attachment methods.

Common examples of braze-ons include:

• Cable guides: These guide brake and derailleur cables along the frame, ensuring smooth and efficient operation.
• Water bottle cage mounts: These provide secure attachment points for water bottle cages.
• Rack and fender mounts: These allow for the installation of racks and fenders for carrying cargo or protecting the rider from the elements.
• Shift lever mounts: Older style downtube shifters, and sometimes brake levers, were mounted via braze-ons.
• Pump pegs: Used to hold a frame pump.

The specific types and placement of braze-ons can vary depending on the intended use and design of the bicycle frame. Braze-ons are typically installed during the frame-building process, before painting or finishing.