Optimize your power transfer with the Box One Oversized Single Speed Cog , engineered for elite- level performance and durability. CNC- machined from high- strength chromoly steel , this cog features a sleek ED black finish with laser- etched graphics for a premium look that lasts. Designed specifically for OS spline drivers — including the Onyx Ultra SS Driver — it’s compatible with both 3/ 32” and 1/ 8” chains , giving you flexibility across race setups. Available in 14T to 18T sizes, this cog delivers smooth, consistent engagement and efficient power output. Weighing as little as 20g ( 14T) , the Box One Oversized Single Speed Cog is the perfect upgrade for serious BMX racers demanding precision, strength, and performance. View Whitepaper: Box® - Stealth Hubs Whitepaper 06.12.25