Q-Tubes Standard 27. 5"+ Presta Tube No more stuffing odd-size replacement tubes into your 27. 5"+ bikes, these Q-Tubes Standard 27. 5"+ Presta Tubes are designed with your plus sized tires in mind. Grab a few for the trail and be prepared for any mishaps. Features 32mm valve 27. 5"+ specific sizing Presta Valve(screw top) Removable valve core | Quality | Teravail Standard 27. 5"+ Presta Tube 27. 5" X 2. 8"-3. 2", 32Mm Valve