Box Two External Oversized Bottom Bracket Description: The Box Two External Oversized Bottom Bracket is a replacement BSA BB for the Box Two M30 cranks. The aluminum shell paired with the precision sealed bearings keeps the weight low and your cranks spinning smooth. NOTE: Designed to work with Box Two M30-P, M30-M or other Praxxis M30 cranks ONLY Features: Replacement BSA bottom bracket for Box Two M30 cranks 6061-T6 Aluminum BSA (Euro) Specifications: Shell Width: 68mm Spindle Type: 30mm Thread: 1.37" x 24 TPI Weight: 3.9 oz (110g) Color: Blue Make sure you have the right tools for the job. Browse our bottom bracket tools here. If you need assistance finding the right tool, reach out to our friendly customer service team (phone, email, and live chat at the bottom of this page).