BMX US Type Bottom Bracket BB Cup Set 5/16" Ball Bearings Cages
- High quality Valvert brand BMX Bottom Bracket for One Piece BMX Cranks.
- Large 5/16th caged ball bearings.
- Standard 24TPI
- Silver finish
- Fits most old school BMX bikes otherwise known as US or USA
- USA cups are 52mm they fit into a 52mm frame hole (these are by far the most common bmx bottom bracket type
- THESE DO ALSO FIT SOME EXERCISE BIKES