I have a Giant Revolt Advanced 3 2022. I have upgraded wheels, tires, handlebars, and some other bits. I like the fit and it's ride.

Now, I want to upgrade the OEM FSA Omega crankset to get something lighter (Allor or carbon) and with slightly lower gears. I am also willing to replace the BB to get more agility in sizing the crankset to something else. Every time I think I understand compatibility I get stumped again.

I seem to have a BB30, press fit, into a frame with a BB shell of approx 90 mm width. (Actually, the fitting is labelled B3044 and also BB-AL86 19.) Do I call this a BB30 or BB86 with a 19 mm spindle for compatibility considerations?

I am currently running 172.5 length, with a 48/32. I'd like to get to a 46/30; 48/30 or similar. I'd like to keep 172.5s, but am open to 170 crank length.

The factor that really seems to limit my options the most is the 90mm bb sheel width. Am I understanding all of this correctly?

Is there a way to make a GRX crankset fit?

I am open to any suggestions for an upgrade plan that brings this project home for less than $400. I can do the labor. My concern is parts compatibility. I am willing to get new, new task off, or gently used cranksets.

Thanks!