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Message: <blockquote data-quote="Schwepps" data-source="post: 284981" data-attributes="member: 3592">There can be a few reasons, danc. In partial deflation, some RFT tyre models may deform sufficiently to trigger the alert, and some may not. It would work more reliably with normal tyres like DYs which deform more than RFTs with a given deflation. Another thing is you still have to reset (recalibrate) after each inflation or tyre change or swap. Your friend may have missed doing it. I've forgotten a few times.TPMS is the only way to be sure because it measures the actual air pressures in each tyre and transmits them by low power radio signal. Like an F1 car! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /> I think they're mandatory in the US for RFTs.</blockquote>