Dia-Compe Brake Axle Nut

Dia-Compe Brake Axle Nut is a brake nut for installing rim brakes where the brake caliper axle passes through the fork or frame and is tightened from the back. It is available in several lengths because the clearance through the fork crown and brake bridge varies between different bicycles.

The nut supplied with the brake does not always have the correct length for your particular frame or fork. As a general guideline, a steel fork will often work with a 13 mm nut, while carbon forks usually need at least 20 mm. For the rear brake, 10 mm is common. However, there is no fixed standard among frame, fork, and brake manufacturers, so always check which length your build actually requires before ordering.

The nut has a 6 mm diameter and is available in lengths of 10, 13, 20, and 28 mm. Choose a length that reaches the brake axle securely without bottoming out before the brake is properly tightened.

Quick Specs

• Product type: Brake nut / brake axle nut
• Diameter: 6 mm
• Lengths: 10, 13, 20, and 28 mm
• Common front length, steel fork: Approximately 13 mm
• Common front length, carbon fork: At least approximately 20 mm
• Common rear length: Approximately 10 mm
• Important: Recommended lengths are for guidance only – check the frame, fork, and brake before purchasing
• Manufacturer: Dia-Compe