A tread rubber G has a short-fiber-mixed rubber portion 10 forming a grounding surface. In a region Y1 between an outer grounding end Eo and a tire equator C located outside of a vehicle when a tire is mounted to the vehicle, the short fibers f are inclined and oriented at an angle .alpha. outward of the vehicle radially outward of the tire, and an angle .alpha.1 of the short fibers f in the outer grounding end Eo is greater than an angle .alpha.2 of the short fibers f in the tire equator C.

 
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