TIRE

A tire having a sidewall groove (42) adapted to deform between a non-deformed state and a deformed constricted state in response to a bending of a sidewall bending region of a first sidewall (12) within a rolling tire footprint, wherein a first groove axis (10) extends along the cross section of the sidewall groove (42) through the center of it and perpendicular to the outer side (11) of the first sidewall (12) and a second axis extends through the center of the sidewall groove (42) and perpendicular to the first groove axis (10), a groove width along the second axis and between respective groove sidewalls is between 1.5 mm and 4.0 mm and a groove angle (±) is between 28° and 33° as measured between the first groove axis (10) and a plane (13) parallel to a road surface on which the tire is positioned with its tread.