evo.com | Pirelli Tubes > Butyl do as butyl be, as the old saying goes. A Pirelli SporTUBE Presta Tube doesn't do much other than hold air, but that's all you ever want your tube to do. You can take a gamble and go with a no-name job from the hardware store, or you can rock one of the most famous names in pneumatic tire history. The choice is yours. Butyl Compound Lightweight 2.1 - 2.4" : 200g / 2.5 - 2.8" : 300g 48mm Presta Valve | Pirelli SporTUBE Presta Tube 27.5 2023 - 2.1-2.4 / 48mm in Black