Tire system for motorcycles including annular tire core with radially inner groove

摘要

A tire system for motorcycles comprises a pneumatic tire having a cavity, an annular tire core made of an elastic closed-cell material disposed in the cavity and provided on the radially inside with a groove, and a pressure bag inserted in the groove, wherein: in a free state of the tire core not disposed in the cavity, the cross sectional area Sa of the tire core is in the range of from 3.1 to 4.8 times the cross sectional area Sb of the groove; and the total Sa+Sb of the cross sectional area Sa of the tire core and the cross sectional area Sb of the groove is in the range of from 1.0 to 1.3 times the cross sectional area Sc of the cavity.