WHEELS MANUFACTURING BSA 30 BOTTOM BRACKET - ABEC-3 BEARINGS, THREADED TO 30MM WIDE, BLACK, FITS SPINDLES 104MM AND WIDERDESCRIPTION Machined aluminum bearing cups thread in to a standard BSA frames. Allows for the use of 30mm spindle crankset Enduro ABEC 3 sealed bearings are replaceable Grade 10 chromium steel balls, 52100 High Carbon Chromium Alloy Races Made in the USA For use with 30mm diameter cranks with a spindle length of at least 104mm when used in a 68mm wide BB shell Will not work with standard BB30 cranksets, please measure your BB30 crank spindle length