FEATURES:6061 CNC machined Alloy cups w/Precision sealed bearings.

BEARINGS:19mm Mid Sealed (x2) (w/ American cups)
SPINDLE:19mm, 8 Spline (included in $31.99 kit)
SPACERS:6061 Alloy cones w/ 15/16″/19mmhat washer and 4x spacers included

NOTE:These sealed American BB & American BB sealed upgrade kit (w/8-spline spindle)aredesigned to replace the 8 spline spindle and bearings of an unsealed American BB with a sealed version. Fits most complete bikes that come with unsealed American 19mm BB.