Black Ops Mid / American Dualie Bottom Bracket – 19mm

he Black Ops Dualie bottom bracket is a sealed bearing BMX bottom bracket designed to work in both Mid and American bottom bracket shells. It provides a simple solution for frames that need flexibility between these two common BMX standards.

This bottom bracket is typically used when replacing worn bearings or when building a BMX frame that may not use a traditional Euro-threaded shell.

Key Features
• Sealed bearing bottom bracket for BMX applications
• Compatible with Mid and American BB shells
• CNC-machined 6061-T6 aluminum construction
• Anodized surface finish
• Designed for 19mm BMX crank spindles

Compatibility & Use Notes
• Compatible with Mid and American BB shells
• Press-fit cup design
• Designed for 19mm spindle cranksets
• Cup OD / bearing OD options: 41mm (Mid) or 51mm (American)
• Not compatible with Euro-threaded BB shells

Service / Ownership Context
Correct cup selection and proper press fit are critical. Shell condition and alignment affect bearing life, especially on American BB frames. Bearings should spin freely once installed with the crank properly spaced and torqued.

Fit & Use Signals
• Good fit if your frame uses a Mid or American BB shell
• Good fit if your crankset uses a 19mm spindle
• Good fit for BMX builds and replacements
• Not a fit for Euro-threaded BB shells
• Not a fit for cranksets with larger spindle diameters