It is possible there is a rim leak. But you need to
verify your measurements first. If I were you, I would measure pressure 10 times in morning and 10 more times in evening. Then you'll see differences. Air inflators with auto shutoff is not accurate.
found good one, cigarette lighter plug, so minimize shield view
found good one, cigarette lighter plug, so minimize shield view impact: Vesafe Wireless Tire Pressure Monitoring System (TPMS), with 4 External Cap sensors. (Cigarette Lighter Plug with 2A Charging)
上周五打足气到 ３１ psi，一直没开过， 今天用自动打气机（可以设定气压的那种）再次打气，起始气压好象是２８psi。看来轮胎问题不大（今天天气比较凉快，可能是个原因）。
有个疑问，上星期发现问题的时候，轮胎气压好像１８psi左右，是因为新轮胎装上的时候就一直没有打足过气？（半年前新换的轮胎，也一直没有测过气压）
thanks again for your time and any input
(原帖)最近一直在家工作，前天偶然发现一个轮胎看起来气不足，量了一下，大概１８psi，打足气到３１psi，今天再查下大概是２８psi，轮胎是新换的，是不是轮胎在漏气？现在疫情，去shop检查比较麻烦，是请他们来上门pickup;
also using soap spray, no found leaking on valve and exterior lip
correct, just having 30 min driving on last weekend after put 31 psi
verify your measurements first. If I were you, I would measure pressure 10 times in morning and 10 more times in evening. Then you'll see differences. Air inflators with auto shutoff is not accurate.
Best regards
Alex
如果不会，就交钱让别人去做，不要如此纠结。
Tymate Tire Pressure Monitoring System-Solar Charge, 5 Alarm Modes, Auto Backlight & Sleep & Awake Mode, Tire Position Exchange, with 4 External Tmps Sensor (0-87 psi)
found good one, cigarette lighter plug, so minimize shield view impact: Vesafe Wireless Tire Pressure Monitoring System (TPMS), with 4 External Cap sensors. (Cigarette Lighter Plug with 2A Charging)