Abstract: A tire-safety sensing device includes a supporting rod having one end connected to the body of the vehicle, located beside a tire, a fixing peg to pivotally connect the sensing device to a sensing rod to provide swinging motion, a contacting wheel with a bearing mounted onto the top end of the sensing rod, a spring (tortional spring) being mounted to the fixing peg, the two ends of the spring being mounted to a protrusion within a notch provided at the supporting rod and a protrusion of the sensing rod, the spring urges the sensing rod towards the tire such that the contacting wheel is in contact with the tire.