Heavy duty pneumatic tire

An assembly comprising a heavy duty pneumatic tire, and a tire rim flange,

• wherein the heavy duty pneumatic tire comprises:
• a tread having an outer surface that forms a tread surface;
• a pair of sidewalls that extends substantially inward, in a radial direction, from ends, respectively, of the tread;
• a pair of beads positioned substantially inward of the sidewalls, respectively, in the radial direction;
• and
• a clinch portion that extends from the sidewalls to the beads;
• and
• a concave curved surface extends on an outer surface of the clinch portion in a circumferential direction, the concaved curved surface being the whole concaved portion of the outer surface of the clinch portion, and being composed of a single arc, on a cross section as taken along a plane including a center axis of the tire, and
• wherein:
• the tire rim flange comprises a convex curved surface formed on an outer side end, in the radial direction, of the tire rim flange, and the convex curved surface of the tire rim flange engages with the concave curved surface,
• a ratio R1/R2 of a radius of curvature R1 of the concave curved surface to a radius of curvature R2 of the convex curved surface of the rim flange, satisfies
• 1.7≤R1/R2≤3.9,
• a ratio D1/R2 of a depth D1 of the concave curved surface to the radius of curvature R2 of the convex curved surface satisfies
• 0.05≤D1/R2≤0.09, and
• the radius of curvature R1 of the concave curved surface and the radius of curvature R2 of the convex curved surface are each a radius of curvature of an arc on the cross section as taken along the plane including the center axis of the tire.