Tyre system for motorcycles

摘要

A tyre system for motorcycles which comprises a pneumatic tyre (2) having a cavity, an annular tyre core (6) made of an elastic closed-cell material disposed in the cavity and provided on the radially inside with a groove, and a pressure bag (5) inserted in the groove, wherein in the free state of the tyre core when it is not disposed in the cavity, the cross sectional area Sa 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 tyre 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.