Gonna be a dick and point out that if you run smaller than a 32t, you don’t need a power meter, you need a gym. Edit: it’s not my opinion, just an uncomfortable matter of fact for why they don’t make power meters for 30t rings. I’m sure there are exceptions, like people riding fully loaded 87lb touring bikes who pump out 450 watts so they can go at a walking pace. Or Primoz who apparently lives in a magical land where rock climbing and mountain biking intersect.