THEORY - AMERICAN BB CUP

[Traditional American BB repair and conversion seat]

American BB loose ball bearing kit for retro or entry-level BMX models. Aluminum alloy processed MID bearing conversion seat can be used with THEORY MID sealed bearings (sold separately).

- Material: AL6061 aluminum alloy CNC processing

- Inner diameter: 41MM, Outer diameter: 51.5MM

- 51.5MM US BB only, can be switched with THEORY MID bearing set

- Color: BLUE, RED , GOLD, PURPLE, SILVER

- Weight: 76g

- Made In Taiwan

＊It is recommended to have this bearing replaced by a professional store for assembly

＊Traditional loose bead bearing modification requires additional purchase of 19MM or 22MM axle