Pneumatic tire

A pneumatic tire comprising:

• a pair of beads each including a core extending in a circumferential direction;
• a carcass extending on and between one of the bead cores and the other of the bead cores;
• a pair of run flat side reinforcing layers each located axially inward of the carcass;
• a tread having a tread surface configured to be in contact with a road surface;
• a pair of sidewalls extending radially inward from ends of the tread along the carcass, on an axially outer side of the carcass;
• and
• a pair of clinches one located radially inward of each of the sidewalls, wherein when the tire is in its normal state,
• the tire has seat contact surfaces each of which is configured to be in contact with a seat of a rim on which the tire is to be mounted, and side surfaces extending on and between the tread surface and the seat contact surfaces,
• each side surface includes a flange contact surface which is in contact with a flange of the normal rim, and a flange opposed surface which abuts the flange contact surface, is located radially outward of the flange contact surface, and is the entire surface opposed to the flange,
• the flange opposed surface has a diameter increasing outward in an axial direction along the entire axial extent of the flange opposed surface,
• the shape of the flange opposed surface is a circular arc in every cross-section of the tire as taken along a plane including a rotation axis of the tire,
• a radius of the circular arc is not less than 12.0 mm and not greater than 18.0 mm,
• a radial distance from the bead base line to a radially inner end of the flange opposed surface is not less than 12.0 mm and not greater than 18.0 mm,
• each clinch forms the flange contact surface and the flange opposed surface,
• a complex elastic modulus of each clinch is not less than 30 MPa and not greater than 60 MPa.