Race face x type team xc bb cupsmanufactured from high strength aluminium and featuring twice the number of ball bearings than competitors the bb cups are also compatible with shimanos external system making for a great upgrade forged and cnc machined from 7050 aluminium features 35 more thread engagement and substantially thicker walls than the atlas cups for greater durability in big hit situations massive external bearings have 35 larger ball bearings than internal systems yieldi