A method of estimating a load on a vehicle tire, comprising: attaching at least one deformation measuring sensor (20, 22) to at least one sidewall (26, 28) of the vehicle tire, the deformation measuring sensor generating a cyclical deformation signal having a signal power level indicative of a deformation of the one sidewall in the tire under a rolling condition; providing a tire inflation pressure measuring sensor, the inflation pressure measuring sensor measuring tire inflation pressure within a tire cavity and generating detected inflation level data; electronically storing power-to-load maps adjusted for tire inflation pressure for the tire, the maps correlating a range of load levels to a range of signal power levels whereby operatively enabling a load level to be identified for each signal power level adjusted for tire inflation pressure; measuring a detected signal power level of a deformation signal from the deformation measuring sensor; measuring a detected inflation level from the tire cavity by means of the tire inflation pressure measuring sensor; and extracting from the signal power-to-load maps a tire pressure level-adjusted estimated load level corresponding to a detected signal power level; characterized in that the tire inflation pressure measuring sensor is attached to the vehicle tire; and in that the method further comprises attaching at least one inner deformation measuring sensor in an axially inwardly located tire sidewall and attaching at least one outer deformation measuring sensor in an axially outwardly located tire sidewall, measuring a detected inner signal power level from the inner deformation measuring sensor, measuring a detected outer signal power level from the outer deformation measuring sensor, averaging the detected inner signal power level with the outer signal power level to create an averaged detected signal power level, and using the averaged detected signal power level to extract from the signal power-to-load maps an estimated load level corresponding to the averaged detected signal power level at the detected inflation level. attaching at least one deformation measuring sensor (20, 22) to at least one sidewall (26, 28) of the vehicle tire, the deformation measuring sensor generating a cyclical deformation signal having a signal power level indicative of a deformation of the one sidewall in the tire under a rolling condition; providing a tire inflation pressure measuring sensor, the inflation pressure measuring sensor measuring tire inflation pressure within a tire cavity and generating detected inflation level data; electronically storing power-to-load maps adjusted for tire inflation pressure for the tire, the maps correlating a range of load levels to a range of signal power levels whereby operatively enabling a load level to be identified for each signal power level adjusted for tire inflation pressure; measuring a detected signal power level of a deformation signal from the deformation measuring sensor; measuring a detected inflation level from the tire cavity by means of the tire inflation pressure measuring sensor; and extracting from the signal power-to-load maps a tire pressure level-adjusted estimated load level corresponding to a detected signal power level; characterized in that the tire inflation pressure measuring sensor is attached to the vehicle tire; and in that the method further comprises attaching at least one inner deformation measuring sensor in an axially inwardly located tire sidewall and attaching at least one outer deformation measuring sensor in an axially outwardly located tire sidewall, measuring a detected inner signal power level from the inner deformation measuring sensor, measuring a detected outer signal power level from the outer deformation measuring sensor, averaging the detected inner signal power level with the outer signal power level to create an averaged detected signal power level, and using the averaged detected signal power level to extract from the signal power-to-load maps an estimated load level corresponding to the averaged detected signal power level at the detected inflation level.