A tyre includes a tread portion including a land portion having a ground contact surface and at least one sidewall. The land portion is provided with a radial channel extending from a radially outer end opened at the ground contact surface to a radially inner end, an internal lateral channel extending under the ground contact surface within the land portion and having one end opened at the at least one sidewall and communicating with the radially inner end of the radial channel, and a sipe opened at the ground contact surface and communicating with the radial channel and the internal lateral channel. The radially outer end of the radial channel has an axial opening width in a range of from 5% to 20% of an axial width of the land portion.