Seven watts per kilo. That is the number being thrown around as the new absolute best standard, courtesy Tadej Pogacar and Jonas Vingegaard battling in this year's Tour de France. Yesterday we saw Yara Kastelijn win stage 4 of the TdF Femmes with a solo attack out of a breakaway, and she was averaging 5.13w/kg over the final two categorized climbs to the finish.

How much can you do? How much are your local competitors doing? How much can you improve this number? And how can we best measure this number?

The devil is in the details, and we dig into all of those today - along with our new metric for measuring maximum sustainable power on the road - xPower.

xPower is an advanced average of your power output that considers shorter higher-powered efforts for a true physiological representation of your power output. While Normalized Power often overestimates what a rider can do, xPower analyzes highly variable power output to give the true physiological effort.

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