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Zero offset
The zero offset is an important feature of the power meter that resets the zero offset value for the power meter sensors. There
are physical and environmental conditions that may affect the zero offset value and there are methods both manual and
automatic that will adjust this value to accommodate for the changing physical and environmental condition. The zero offset
of the power meter is essentially the sensor reading or values measured when the power meter has no pedaling load (torque)
applied. The act of resetting the zero offset causes the power meter to measure the value at zero load and then records this
value as the baseline for power measurement. Loads applied while pedaling will then be measured as torque and used by
the sensor to determine power in Watts. The zero offset value can be affected by the installation of the crank arm and the
tightening of the securing hardware. The torque applied to the securing hardware can impart some strain into the crank
material that is easily accounted for by manually resetting the zero offset. Any time the power meter is removed from the
bike and reinstalled the zero offset should be reset.
Ambient temperature shifts can also affect the zero offset to some extent. To ensure maximum accuracy it is advisable to
manually rest the zero offset before each ride. The power meter utilizes automatic temperature sensors to compensate for
temperature changes that take place during the ride. This is done automatically while you ride and you need not take any
further steps to “zero” the sensor during the ride.
How to reset the zero offset
Resetting the zero offset is a function controlled by the cycle computer or mobile device (display units) paired to the power
meter. Please note that some device manufacturers refer to the step of resetting the zero offset as “calibration”. When paired
to a compatible ANT+ cycle computer or Bluetooth Smart mobile device, the power meter and display units are in two-way
communication. The display unit can send a command to the power meter to reset the zero offset value and in some cases
the resulting zero offset value will be sent back from the power meter to the display unit and be shown on the screen. The
display units will also indicate if the procedure was successful or failed.