Tire tread including a decoupling groove

A tire including a decoupling groove, comprising:

• a body,
• a shoulder,
• a tread surface including at least one decoupling groove extending radially inwardly into the body from the tread surface, and
• a plurality of parallel sipes,
• wherein the decoupling groove is oriented adjacent to the shoulder,
• wherein the decoupling groove is defined by an axially outer groove sidewall and an axially inner groove sidewall, has a width W1, and has a centerline,
• wherein the plurality of parallel sipes extend axially into the inner groove sidewall,
• wherein the decoupling groove has a radially inner groove base defined by a curvilinear base surface, has a width W2, and has a center,
• wherein the width W2 is greater than the width W1,
• wherein a centerline of the decoupling groove intersects the center of the groove base,
• wherein the tire has an axial axis A, a radial axis R, and a circumferential axis C,
• wherein the sipes are angled in a plane formed by the circumferential and axial axes, and wherein the sipes are angled in a plane formed by the circumferential and radial axes,
• wherein the sipes are angled by a sipe angle SA1 in the plane formed by the circumferential and axial axes,
• wherein the sipes are angled by a sipe angle SA2 in the plan formed by the circumferential and radial axes,
• wherein SA1 is between 20.0 degrees and 30.0 degrees from the axial axis A, and
• wherein SA2 is between 5.0 degrees and 15.0 degrees from the radial axis R.