3 ms·
My cold tire pressure is supposed to be 33PSI, my TPMS doesn't alert until it's below 28PSI, so there is a significant delta still. The TREAD law does not spec
by bkanber 5y ago
My cold tire pressure is supposed to be 33PSI, my TPMS doesn't alert until it's below 28PSI, so there is a significant delta still.
The TREAD law does not specify when TPMS must alert, other than the tire being 'significantly underinflated'.
- loeg 5y agoThe NHTSA has determined that the requirement is that TPMS alerts for 25% underinflation across any combination of tires, or 30% underinflation in a single tire.[1] Originally they wanted 20-25%, but determined that cheap TPMS sensors were not good enough to meet that threshold and did not want to impose the cost of better sensors. [1]: https://www.nhtsa.gov/sites/nhtsa.gov/files/fmvss/TPMSfinalrule.pdf https://www.nhtsa.gov/sites/nhtsa.gov/files/fmvss/TPMSfinalr...