The ETC inner-tube 22-inch 48mm-shrader-valve is designed for those in-between sizes you’ll find kids bikes coming in occasionally. 22 inch wheel is one you don’t often see around, but they are there, and they need inner tubes like every other size! Designed for use in bicycle wheels with an 8mm valve hole (wider shrader type.) The ETC brand will fit your needs. Fits multiple ETRTO sizes covering 47-457, 54-457 & 57-457.