Folding Bike: Prompt weight savings: using Tubo-Foldingbike makes folding bikes instantly lighter, so they can be carried along easier. Suitable for 16", 18" and 20" folding bicycles like Brompton, Vello, Dahon and Birdy!   Tubo: Super robust and extremely lightweight for everyday use   Features Ideal for 16″, 18″ and 20″ folding bicycles like Brompton, Vello, Dahon and Birdy. Fold your bike and carry it with ease. Small ecological footprint. Less resource intensive production than standard butyl tubes.