By the last interval of a hard set, form slips and one leg often does more of the work, and the Assioma UNO Upgrade Kit lets a Favero Assioma UNO measure both. The kit adds a right pedal with its own power sensor, so the single-sided power meter becomes the dual-sided Assioma DUO without replacing the left pedal already on the bike. A two-meter micro-USB cable and a magnetic connector in the box cover charging for the new pedal. What Our Gearhead(R) Experts Are Saying:"I added the right pedal to my UNO and the first hard ride showed which side did more work once my form started to slip. Because the left pedal stayed on, the upgrade felt like completing the system I already trusted, not starting over."