The Box One Disc Brake Adapter is designed to improve braking control on frames where disc brakes were not standard. Compatible with 2 types of dropouts and 3-10mm hubs, the Box Disc Brake Adapter goes over your hub’s axle and mates with the frame’s dropout in the right configurations allowing mounting of a standard post mount disc brake caliper.

Please note this product is NOT universally compatible. We strongly recommend reading the Compatibility and Installation instructions for details before purchasing.

Material: 6061-T6 Aluminum
Process: Extruded & CNC Machined
Finish: Anodized w/Laser-Etched Graphics
Size: 10mm
Compatibility:
• Mount: Post Mount Caliper
• Brake Rotor: 140mm
• Hubs: 3-10mm
• Dropout: Sliding
Weight: 65g
Rider Weight Limit: 150lbs

This version is compatible with specific sliding plate dropouts with inserts.

Compatibility:

• Box Three Pro Disc Hub
• Box Three Brake Caliper
• Box Three 140mm Disc Brake Rotor
• ALL Box Brake Lever
• Box Linear Brake Cables