The use of the metric system is nearly universal, and especially in the cycling community. ALL implementations of the Metric system of measurement require that the symbol for the term watt(s) be expressed with the capital letter W, NOT a lowercase w. I’m not permitted to link to the actual reference, but it’s easy to check this with the NIST, and with any of the other myriad national metrology bodies. W/kg NOT w/kg!
Why not express these units correctly, and according to US law?!