Cane Creek Hellbender Lite Headset Bearing - 30mm - 41mm - 6.5mm - 36/45Lightweight Aluminium with steel hybrid Hellbender LITE sealed cartridge bearing. ZS44 will take a 41mm bearing ZS56 will take a 52mm bearing IS41 will take a 41mm bearing IS42 will take a 42mm bearing IS47 33 will take a 47mm bearing IS52 will take a 52mm bearing All complete Cane Creek headset assemblies (top or bottom) will use a 3645 degree contact angle bearing, with the exception of the IS47 33 headset assemblies. IS47 33 will use a 4545 degree