Suitable for numerous tire sizes: The 18/28-622 18/25-630 SV 50 Tube by Schwalbe. It is highly elastic and can be used for various tire widths. It is made of butyl rubber, which makes it very robust and ensures good air retention, meaning you don't have to reinflate as often. At the workshop or in your saddlebag, make sure you have a replacement 18/28-622 18/25-630 SV 50 tube! ;"