Just this monday I started noticing a fairly loud squeak coming from what I assume is my cassette, but it could be coming from my crank as well (which is odd, because I didn't change anything between sunday and monday). It only happens when I'm in my 3rd, 4th and 5th smallest cogs (why I think it must be from my cassette), which I find peculiar. And it happens when I put the gas on (as in 2 squeaks per revolution of the crank). I have a SRAM OG1090, which I know is supposed to be loud when shifting, but I don't think this is normal behavior. I've adjusted the RD a few times, but still can't get rid of the creak. The way this cassette is made is the largest 7 cogs are one solid block, and the smallest three are separate–maybe this has something to do with it? Any help would be greatly appreciated!