Yes, the P1 and Single-Sided pedal power meters and your cycling computer (CPU) need to know your crank arm length to give you accurate readings. It’s possible to set this value anywhere between 110mm and 236.5mm, however common settings for bicycles are typically between 160mm to 180mm. Once the P1 pedals are paired to your CPU please refer to your CPU’s manual for proper instructions on setting this value.
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