The Tubo MTB tube can save more than 100g per wheel when compared to standard butyl tubes - and almost twice as much space when packed away for spare use. The riding safety is twice as high compared to standard tubes, offering maximum protection against a breakdown Easy to install and serves as a lightweight alternative for tubeless riders Designed for disc brake use only Labeled Size: 26 x 1.8-2.5" ISO Width: 46-64mm ISO Diameter: 559 / 26" mtn Shaft Type: Smooth Valve: Presta Med 42mm Tube Compound: Thermoplastic Elastomer