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Some Garmon's have an option to set the wheel circumference, if that is set, then it would not matter as it counts revolutions
Take what any gps records regarding altitude with a pinch of salt. The same type of device riding the same route can come up with different numbers.
I understand that any Garmin Edge from the 500 model upwards has a barometric altimeter, and that particular model came out in about 2010.
My old geko needed to be calibrated but I think the newer garmin's have an auto calibrate. I usually ride to a meet point and reset the unit and that seems to avoid odd results but with the newer one I don't think I even need to do that.Problem with barometric altimeters is that they have to be calibrated. If you don't do this when you set off you are liable to get odd results.