T47 is a standard created by custom frame builders. It's threaded, has an inner diameter of 47mm, and is 68mm wide. It has the design benefits of being oversized and wide, but also the practical benefits of threads.Features:The cups have ceramicspeed bearings pressed inThere are two bearing optionsThe standard bearing has ceramicspeed balls and hardened-steel racesThe coated bearing has the same balls running on a 3-micron thick coating placed on top of those hardened-steel races for greater durability and less friction stillThis bb is compatible with 68mm framesBottom bracket tool for installation: bbt-69
