Mine has been 4lbs off (low) compared to my good gauges. No big deal at all since I use the gauge for accuracy and the tpms for a emergency.
So, I was very bored today. Not bored enough to change the air in my tires as my ocd neighbor does. He does this once a month in his 2009 Toyota Tundra. I bet even ZG does not do this.....
I decided since I have a free supply of Nitrogen, I would fill them with this. Anyway, I put the bike on the centerstand, and let the air out by removing the valve core. I put new valve cores in as I am just ocd enough to care about this. Nothign else was done to the tire or wheel.
I filled them with 45lbs of Nitrogen, then dropped it down to 42 with the accurate gauge. As soon as the tpms registered leavign the driveway, it was dead on at 42 and has stayed accurate during 3 short rides this afternoon.
Is it possible these things can calibrate themselves? Maybe most of the moisture being out of the tire changed somethign? I'd be interested to knwo what the hell happened.