TYRE IN TYRE SYSTEMS

摘要

A wheel (10) is provided with a tyre in tyre installation in which an outer ground engaging tyre (13) is mounted on a rim (11) of the wheel and an inner inflatable member (14) is mounted on the rim inside the outer tyre. The wheel rim has a first inflation means (15) mounted on the rim to introduce air into and release air from the inner inflatable member, and a second inflation means (16) mounted on the rim for introducing air into and releasing air from the interior of the ground engaging tyre (13) external to the inner inflatable member (14). The second inflation means (16) is provided with guard means (40) to ensure that air can at all times enter and leave the interior of the ground engaging tyre via an inner end of the second inflation means (16). The guard means including one or more radially extending bores or formations formed in the inner end of the second inflation means or a component mounted thereon through which air can enter or leave the ground engaging tyre.