Note the stages power fsa model will not fit any fsa cranks with a pinch bolt style interface nor will the bb30 version fit bb386evo models additionally it is not compatible with fsa triple chainring cranks the new stages power meter is slimmer and up to 28 percent lower profile than our original meter its sleeker by way of a 17 percent reduction in frontal area and weve also made it stronger the new housing design increases the strength of the battery door and housing connection by 2