TECH APPRAISSAL:
- Item in brand new condition.
- Complete with both frame cups & set of 5/16" caged bearings
- 1 fixed cone, 1 adjustable cone, washers & lock nut
- Standard size for BMX & Mountain bikes that use a solid 1 piece crank
- Known as large shell / USA BB
- Frame cup shell size 51.3mm
- Approx. outside diameter of bearing cages 44mm
- Axle size 21.2mm
- Will also fit 3 piece cranks that use this large shell bottom bracket