frank75528 wrote:型號:GF-31請教...(恕刪) GIYO這品牌蠻普遍的~除非是大廠的專業儀器~一般業餘用市售款有落差很正常~以前車材行買胎壓計跟原廠大錶比也是psi落差兩格~日後灌風就記得補滿那兩格即是正確胎壓~拔氣嘴會漏風就多打一點~想打110psi就灌到120psi再拔~