Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

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Howard in reply to @Brommers

You need some way to turn off the auto-zeroing, which AFAIK was the only difference between the normal P2M spider and the track one - the track one had auto-zeroing disabled, which you can't do with the normal one.

Isn't auto-zero a feature of the head unit, not the PM? Or does P2M do some re-calibration of itself independently of the head unit that you need to turn off for tark?

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Brommers in reply to @Howard

Isn't auto-zero a feature of the head unit, not the PM? Or does P2M do some re-calibration of itself independently of the head unit that you need to turn off for tark?

Nope, it's a feature of the PM. You can use a head unit to trigger a zero calibration, but the auto-zero stuff is done by the PM itself. The conditions in which the PM will carry out an auto-zero are particular to each, and they'll do it themselves. For example, with a Powertap track hub you need to turn off auto-zeroing. You can do that with a Joule GPS cycle computer, and once you've changed that setting you can use any head unit you like - the autozeroing will stay switched off in the hub's firmware.

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Howard in reply to @Brommers

Goes some way to explain why Garmin removed the option shut down auto-zero accross all of its devices regardless of PM type, I guess.

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