Do I need to calibrate my Rival power meter before I use it?

Yes, to ensure the highest level of accuracy we recommend manually calibrating the power meter before each use. Perform the manual calibration with the rider off the bike, and the drive side crank arm at 6 o’clock. Use your device’s “calibrate” command to zero the power meter. The power meter will return the Zero Offset value to the cycling head unit. See the user manual for Zero Offset value specifications.

Related article: Does the Rival power meter have temperature compensation?