CNC machined&44; heat treated&44; hollow M12 chromoly spindle. Shot peened finish for strength. Forged & CNCd aluminum cups & reinforcing sleeve. Single row&44; double sealed cartridge bearings. High-pressure contact lip seal in conjunction with low friction labyrinth cup seal keeps out contaminants & increases bearing life. Newly enhanced extreme conditions bearing grease. Features TWO bearings on the drive side to accommodate higher drive train loads. 96 ball bearings in each bottom bracket. Fixed cup spacer (2.5mm) allows BB to be used with either 68 or 73mm shells. Proprietary non-side loading design. Available in:ISIS 113 FR 68/73mm