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Greetings! Proudly celebrating 9 years of cycling magic in the Laurel District. Enjoy new LOWER prices on Marin, SE, Fuji and Breezer in stock. Wait time for most repairs is 1-3 days. Flat fixes are same day if brought in by 12pm. Our December 2023 hours are: M-F 11-6, SAT 10-5. Closed 12/24-12/28. Questions? E-mail us at or text/call us at 510-328-1158.

BOX One BMX Disc Brake Adaptor 10mm Dropout

BOX One BMX Disc Brake Adaptor 10mm Dropout
Please select options


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

- Box Three Pro Disc Hub
- Box Three Brake Caliper
- Box Three 140mm Disc Brake Rotor
- ALL Box Brake Levers
- Box Linear Brake Cables

- Post Mount Caliper Compatibility
- 140mm Brake Rotor Only
- 6061-T6 Aluminum
- Standard 10mm Dropout - 60g
- Fits 3 - 10mm hubs (See Compatibility Below)
- 150lb Rider Weight Limit

Part Numbers

Option UPC MPN
Black 616043831350 BX-BA1-DAA10-BK