Method for determining the depth of tread of a vehicle tyre with a tyre module arranged on the inner side of the tyre, comprising the following steps: a) measuring acceleration signals from a tyre module arranged on the inner side of the tyre, the tyre module being arranged substantially opposite the tread strip and comprising an acceleration sensor for measuring acceleration values (a, a0, a1, a2) in a radial direction, b) determining a minimum acceleration value during rotation of the vehicle tyre and at a constant travelling speed the tread strip with the opposite tyre module being in the region of the ground contact area of the vehicle tyre at the time of the acceleration measurement, c) determining the maximum internal radius of the inner side of the tyre in the centre of the ground contact area of the vehicle tyre, the maximum internal radius reflecting the curvature of the inner side of the tyre in the circumferential direction of the ground contact area and being substantially dependent on the thickness of the rubber package between the tyre breaker belt and the roadway, the maximum internal radius being determined from the quotient of the travelling speed squared and the minimum acceleration value d) determining the depth of tread of the vehicle tyre with signal processing, the maximum internal radius changing significantly as the depth of tread decreases and the determination of the depth of tread being based on the fact that the depth of tread is coupled with the maximum internal radius via a direct mathematical function (equation 2), e) transmitting the determined depth of tread to a receiving unit in the vehicle and/or indicating the depth of tread by an indicating device. a) measuring acceleration signals from a tyre module arranged on the inner side of the tyre, the tyre module being arranged substantially opposite the tread strip and comprising an acceleration sensor for measuring acceleration values (a, a0, a1, a2) in a radial direction, b) determining a minimum acceleration value during rotation of the vehicle tyre and at a constant travelling speed the tread strip with the opposite tyre module being in the region of the ground contact area of the vehicle tyre at the time of the acceleration measurement, c) determining the maximum internal radius of the inner side of the tyre in the centre of the ground contact area of the vehicle tyre, the maximum internal radius reflecting the curvature of the inner side of the tyre in the circumferential direction of the ground contact area and being substantially dependent on the thickness of the rubber package between the tyre breaker belt and the roadway, the maximum internal radius being determined from the quotient of the travelling speed squared and the minimum acceleration value d) determining the depth of tread of the vehicle tyre with signal processing, the maximum internal radius changing significantly as the depth of tread decreases and the determination of the depth of tread being based on the fact that the depth of tread is coupled with the maximum internal radius via a direct mathematical function (equation 2), e) transmitting the determined depth of tread to a receiving unit in the vehicle and/or indicating the depth of tread by an indicating device.