A method of analyzing a contact patch of a tire (150, 200, 500) during a hydroplaning event, comprising: obtaining a piezoelectric sensor output signal (220, 240) from at least one piezoelectric sensor (114, 616) mounted in a tire (150, 200, 500), the piezoelectric sensor output signal (220, 240) being generated at least in part during a hydroplaning event; analyzing, with one or more processing devices, the piezoelectric sensor output signal (220, 240) to determine a contact patch entry (222, 242) and a contact patch exit (224, 244) for the tire (150, 200, 500); detecting, with the one or more processing devices, a signal perturbation (245, 255) corresponding to the hydroplaning event in the piezoelectric sensor output signal (220, 240), the signal perturbation (245, 255) occurring at a time between a time associated with the contact patch entry (222, 242) and a time associated with the contact patch exit (224, 244); and assessing a quantitative degree of hydroplaning for the tire (150, 200, 500) during the hydroplaning event based at least in part on the signal perturbation (245, 255); wherein the quantitative degree of hydroplaning indicates how much of the contact patch was separated from a static surface by a fluid during the hydroplaning event; characterized in that the quantitative degree of hydroplaning is determined based on a ratio of the difference between a time corresponding to the signal perturbation (245, 255) and a time corresponding to the contact patch entry (222, 242) to the difference between a time corresponding to the contact patch exit (224, 244) and the time corresponding to contact patch entry (222, 242). obtaining a piezoelectric sensor output signal (220, 240) from at least one piezoelectric sensor (114, 616) mounted in a tire (150, 200, 500), the piezoelectric sensor output signal (220, 240) being generated at least in part during a hydroplaning event; analyzing, with one or more processing devices, the piezoelectric sensor output signal (220, 240) to determine a contact patch entry (222, 242) and a contact patch exit (224, 244) for the tire (150, 200, 500); detecting, with the one or more processing devices, a signal perturbation (245, 255) corresponding to the hydroplaning event in the piezoelectric sensor output signal (220, 240), the signal perturbation (245, 255) occurring at a time between a time associated with the contact patch entry (222, 242) and a time associated with the contact patch exit (224, 244); and assessing a quantitative degree of hydroplaning for the tire (150, 200, 500) during the hydroplaning event based at least in part on the signal perturbation (245, 255); wherein the quantitative degree of hydroplaning indicates how much of the contact patch was separated from a static surface by a fluid during the hydroplaning event; characterized in that the quantitative degree of hydroplaning is determined based on a ratio of the difference between a time corresponding to the signal perturbation (245, 255) and a time corresponding to the contact patch entry (222, 242) to the difference between a time corresponding to the contact patch exit (224, 244) and the time corresponding to contact patch entry (222, 242).