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Manual Zero
The Manual Zero procedure should be performed before every ride with the rider off the bike and with the
drive-side crank arm at 6 o'clock.
The power meter may be zeroed manually by sending the "Calibrate" command from an ANT+™
compatible bike computer. The power meter will return the Zero Offset value (or "Current Calibration" on
some computers) to the computer; however, not all ANT+ computers will display the value. The Zero Offset
is typically between +/- 1000. Some units will always have a Zero Offset value outside of this range without
any impact on performance. What is more important is that the pre- and post-ride Zero Offset values are
within 50 points of each other. If the pre- and post-ride Zero Offset values frequently vary by more than 50,
or if day-to-day values vary widely, please call Quarq customer service.
When performing the Manual Zero procedure, put the drive side crank arm in the 6 o'clock position,
keeping the cranks stationary with no force on the pedals. Follow the pairing instructions specific to your
ANT+ computer to send the "Calibrate" command. The LED will flash one time when zeroing is complete.
g a r M I n ® e d g e ® 8 0 0
Click the Power button → tap the Dumbbell icon
g a r M I n e d g e 5 0 0
menu → settings → bike settings → bike 1 → anT+Power → Calibrate
g a r M I n F o r e r u n n e r ® 3 1 0 X t & 9 1 0 X t W at C h
mode → bike settings → bike 1 → ant+Power → Calibrate
Auto Zero
Spin the crank backwards for 4-5 complete revolutions. The LED will flash one time when zeroing
is complete. The computer will not display the Zero Offset value. The Auto Zero procedure may be
performed while coasting with the rider on the bike, stopped using one or both feet, or by hand with the
rider off of the bike.
Zero Offset Stabilization
With a new power meter or newly installed chainrings, the zero offset takes 2-3 rides to stabilize. During
this time you should perform the Manual Zero procedure regularly to ensure accurate power readings.
Short, hard efforts in both chainrings on your first ride will speed up stabilization.
→ Calibrate
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Zeroing
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