The fsa megaexo stages power meter upgrades an array of fsas megaexo 24mm crank options with power the stages power meter is mounted to fsas hollow forged energy alloy non drive crank arm note the megaexo model will only fit megaexo crank systems 2014 and newer and will not fit the megaexo omega model the stages power fsa model will not fit any fsa cranks with a pinch bolt style interfacespecifications accuracy 2 weight only adds 20gr to base crank arm battery life 200 hours coin