This is a 16x1.1-1.4" tube, used most commonly (at our shop) on our Brompton folding bikes, except for the P Line, which may use this AV4 schrader tube or the thinner presta valve, which is the SV4 tube. The P Line tubes need replaced with the same style, schrader or presta, that originally came on your bike. For a more in-depth write-up on tube sizing and why we like selling Schwalbe tubes specifically, check out our blog post on the subject.