Originally Posted by
wanders
This is from the Garmin forum. It backs up what matt said.
"A change from previous Powertaps happened with ANT+, where zero'ing the torque offset was previously done while coasting, it is now done when stopped. The hub should auto-zero any time it is stopped, but the manual calibrate is there just in case."
Where is this Garmin forum? I haven't found anything like that on their web site.