PF30 (Press-Fit 30) is a bottom bracket standard where the bearings press directly into a wider frame shell, accommodating a 30mm crank spindle. The main advantage is that the wider shell lets frame builders create a stiffer bottom bracket area while keeping weight down, which is why you'll mostly find PF30 on carbon gravel frames built for speed.
The trade-off is maintenance. Press-fit cups can develop an annoying creak over time, especially in the muddy, wet conditions gravel bikes regularly see. Unlike threaded bottom brackets that simply screw in and out at home, PF30 requires a press tool for installation and removal — not ideal for trailside fixes.
PF30 makes the most sense if you're prioritizing frame stiffness and low weight for racing or fast riding, and you don't mind more involved maintenance. For bikepacking or adventure riding where reliability and easy field repairs matter more, a threaded standard like BSA or T47 is generally the wiser choice.