T47 is a new bottom bracket standard that is becoming increasingly popular with custom bike manufacturers. The “T” stands for “threaded” and the “47” is the approximate outside thread diameter of the cup, in millimeters. T47 bottom bracket cups are not compatible with the much smaller BSA threaded BB shells.
T47 is a newer bottom bracket shell design, utilizing the oversized interface of PF30 and EVO386, but with the benefit and peace of mind of a threaded interface. This bottom bracket allows you to install SRAM DUB 28.99mm cranks into a T47 shell.
It's compatible with 86mm wide frames, and also compatible with TREK T47 85.5mm wide frames.