Crank length is not used with quarqs. Only used with pedal based power meters. . So, no matter what you set it to its irrelevant.

or with Power2max or SRM. The crank based power meters measure the torque exerted on the spider so the crank length isn't needed only cadence.

Hugh

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Genetics load the gun, lifestyle pulls the trigger.

It may be unnecessary to set crank length on your particular powermeter, but you still bring up a valid issue. I have a powertap P1, and my experience is the same as what you detail for power meter 2. I can reach the spot to manually adjust crank length, but it won't save and sends me to a blank background screen. After troubleshooting with garmin support, my device was determined to be faulty and requires warranty replacement.

There is a firmware bug on version 5.3, either return it back to earlier version or waitfor thefix to come out soon, personally i make sure it never updates itself via garmin express or through app

Neil

Version 6.0 firmware up there now. Seems to include a fix for this.

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Developing aero, fit and other fun stuff at Red is Faster

True, it fixed the crank length bug. Still don't know why I can turn off auto zero manually on some meters but not others

It sure did, thanks. Now that my power numbers are matched to an accurate crank length, they have declined. I suppose that's what I get for complaining.