A method of using a tyre , the tyre comprising: a tread portion , wherein the tread portion comprises a ground contact surface , a first rubber layer made of a first cap rubber that forms at least a part of the ground contact surface, a second rubber layer made of a second cap rubber that is disposed radially inwardly of the first rubber layer , and at least one groove portion opening to the ground contact surface, the first cap rubber has a loss tangent tanδ1, the second cap rubber has a loss tangent tanδ2 greater than the loss tangent tanδ1, wherein the loss tangent is a value measured using a dynamic viscoelasticity measuring device under the conditions of 5% initial strain, +/- 1% amplitude of dynamic strain, a frequency of 10 Hz, stretch deformation mode and a measurement temperature of 30°C, the groove portion comprises a first indicator in which a bottom of the groove portion locally raises, the first indicator having an outer surface in a tyre radial direction, and the radially outer surface of the first indicator substantially coincides with a first wear line that is parallel to the ground contact surface and passes through a radially outer surface of the second rubber layer , wherein the method comprises running the tyre under a first reference internal pressure, characterized in that the method comprising: running the tyre under a first reference internal pressure until the first indicator appears on a worn ground contact surface ; and running the tyre under a second reference internal pressure greater than the first reference internal pressure after the outer surface of the first indicator appears on the worn ground contact surface . a tread portion , wherein the tread portion comprises a ground contact surface , a first rubber layer made of a first cap rubber that forms at least a part of the ground contact surface, a second rubber layer made of a second cap rubber that is disposed radially inwardly of the first rubber layer , and at least one groove portion opening to the ground contact surface, a ground contact surface , a first rubber layer made of a first cap rubber that forms at least a part of the ground contact surface, a second rubber layer made of a second cap rubber that is disposed radially inwardly of the first rubber layer , and at least one groove portion opening to the ground contact surface, the first cap rubber has a loss tangent tanδ1, the second cap rubber has a loss tangent tanδ2 greater than the loss tangent tanδ1, wherein the loss tangent is a value measured using a dynamic viscoelasticity measuring device under the conditions of 5% initial strain, +/- 1% amplitude of dynamic strain, a frequency of 10 Hz, stretch deformation mode and a measurement temperature of 30°C, the groove portion comprises a first indicator in which a bottom of the groove portion locally raises, the first indicator having an outer surface in a tyre radial direction, and the radially outer surface of the first indicator substantially coincides with a first wear line that is parallel to the ground contact surface and passes through a radially outer surface of the second rubber layer , wherein the method comprises running the tyre under a first reference internal pressure, characterized in that the method comprising: running the tyre under a first reference internal pressure until the first indicator appears on a worn ground contact surface ; and running the tyre under a second reference internal pressure greater than the first reference internal pressure after the outer surface of the first indicator appears on the worn ground contact surface . running the tyre under a first reference internal pressure until the first indicator appears on a worn ground contact surface ; and running the tyre under a second reference internal pressure greater than the first reference internal pressure after the outer surface of the first indicator appears on the worn ground contact surface . <EOS>