PURPOSE: To facilitate attaching to a rim by a method wherein a small diametral flange portion, attachable to a valve hole on the rim by just inserting it, is provided above a large diametral flange portion of a stem formed with a male screw thread portion on an outside peripheral surface portion thereof, in a tube valve for a tire for a small-sized motor cycle.

CONSTITUTION: A tube valve is consisting of a large diametral flange portion 21 embedded integrally in a base rubber 22, a stem 20 having a male screw thread 24, mating with a nut 23 for tightening it, on an outside peripheral surface thereof and a small diametral flange 25 provided above the large diametral flange portion 21. This small diametral flange portion 25 is inserted into and fixed to a hole 27 for the valve on a rim 26 when the valve is attached to the rim 26, thereby, func- tions to prevent swingings of the valve. According to this method, the tube valve may be secured rigidly to the rim by only one nut for tightening it.