Q-Tubes 48mm Long Schrader Tubes Nice. Q-Tubes with 48mm long stems, and Schrader valves. When you need them, you need them. Removable valve cores on these, like on all Q-Tubes. Q-Tubes 48mm Long Schrader Tubes Specifications: Tube compound: Butyl Valve: Long Schrader Valve core: Removable Wall thickness: . 9mm Weight: 175 grams (26"), 235 grams (29"), 147 grams (700x35), 132 grams (700x28) | Quality | Teravail 48Mm Long Schrader Tube 29 X 1. 9-2. 3" 48Mm Long Schrader Valve