Cold tire pressure vs hot

tarnold wrote:
Op again. My tire traker is alarm at 15% low, 25% high, not changeable. Unit is advertised at +/- 2.7% pressure precision. So if I run cold tire pressure 60psi then: error of about 6psi either way. Only interested in low pressure, so if I set base pressure at 60 psi, alarm should sound at about 50psi considering error rate and 15%. But that means the high pressure could sound as low as about 70psi. Yesterday on a short drive with outside temp at less than 70* tire pressure went up to 74psi and high pressure alarm sounded. So on a hot day like Mex’s post, where do you set your base? Do you have to adjust all of your pressures thru out the day? Another’s rule of thumb would only be 3psi for a 30* temp swing?
Where am I figuring wrong.

This sounds like a very good reason to use a TPMS that allows you to set the limits to what you want rather than what they want.

With that setup I would set my pressure where I want it, and mute the alarm when it pops up.