Combination of a valve and wheel rim for small diameter tire

A wheel rim (30) includes a chamber (33) defined in a center of the rim' and a hole (32) is defined through a side of the rim. A rubber valve (40') is engaged with the hole of the rim and has a flange (400) which is engaged with an inner periphery of the chamber. An inflation needle (500) is allowed to penetrate through an air passage (43) in the rubber valve. A passage (34) is defined radially through the rim and communicates with the chamber and the hole so that air enters the tire via the passage.