![Tube 18" BASIC](http://akcyclesports.com/cdn/shop/files/CWTBBSCSCHDR_fd443a5e-baec-481a-a339-3477913b58fe_{width}x.jpg?v=1714893432)
The BASIC bicycle tubes we retail are the ones we source and use for our customers' tubes replacement. They are of fair quality for their price.
Usually, there are 2 types of valves - Schrader / American Valve (AV) & Presta / French Valve (FV) and they come in sizes from 33mm - 48mm for BASIC tubes.