T47 is a newer threaded bottom bracket standard that essentially gives you the best of both worlds. Like traditional BSA threaded brackets, it screws right in—so it's easy to install, remove, and maintain at home, and it won't develop that annoying creak that press-fit brackets are infamous for. But unlike BSA, T47 uses a wider 47mm shell diameter, similar to press-fit designs, which lets frame builders create a stiffer bottom bracket area for better power transfer.
For gravel riding, this matters more than you might think. You're regularly dealing with mud, water crossings, and gritty conditions that can make press-fit brackets creak and wear prematurely. T47's threaded design means you can service it on the road or trail with basic tools—no specialty press required.
It's increasingly showing up on premium gravel frames, and while it shouldn't be your only reason to pick a bike, it's a meaningful quality-of-life upgrade that makes long-term ownership noticeably more pleasant.