These 18 inch wheels are perfect for soap boxes, trailers and little bikes. Quality cycling wheels from Taylor Wheels. 18” is the third and last size of bike wheels for children’s bikes and the transition to big 20” bikes is almost done. Also these 18” bike wheels come into use with trailers and the building of carts. Whereas the 18” bike isn’t used as often, it often happens that the next step to the next largest bike is the 20” bike. Finally the children in this age group grow so quickly that the purchase of an 18” bike isn’t worth it. In the area of 18” bikes there is also, like with the 16” 4 usual tyre diameters are available. You get the exact size of the wheel or the diameter of the tyre through the ETRTO-dimension. There are on the inside of the tyre wall, as well as the tyre width in millimeters. At Taylor Wheels you will find 18” bike wheels with the inner-tire measurement of 355mm. This designation can be found on the side wall of your tyre. The most commonly used size is possibly 47-355 (18 x 2.00).