Go from one-sided to dual-sided power measurement with Garmin's Vector 2S Upgrade Pedal. With your standard 2S system (sold separately) you only have power data from your left leg, which leaves the possibility of unknown discrepancies between your left and right sides. Injuries, natural imbalances, and other factors that leave one side of your body less powerful than the other are common. By measuring power from both legs, you get a much more accurate picture of what you're doing and how to improve on any asymmetry you might have.
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