PNEUMATIC TIRE FOR AN AUTO MOTORCYCLE

Provided is a pneumatic tire for an auto motorcycle capable of improving grip performance while ensuring drainage performance, and also capable of attaining excellent wear resistance. The pneumatic tire for an auto motorcycle of the present invention includes a directional tread pattern having a plurality of different grooves formed on a tread surface, the grooves each converging forward in a rotation direction of the tire, in which: the plurality of different grooves are formed as three different oblique lug grooves (2a to 2c) extending, in a development plan view of the tread pattern, from a tread contact end of the tire to a tire equator line ( e ) as being curved to be deflected to the tire equator line side; the three different oblique lug grooves (2a to 2c) each have lengths ±, ², ³, respectively, the lengths satisfying Expression (I) ²‰¤³