Scorpion SmarTUBE is the mountain bike specific inner tube that blends the innovative features of TPU (Thermoplastic Polyurethane), a specific formulation for the riders that are looking for the best balance between protection against punctures, weight and volume. Polyurethane tube Twice as strong as a regular butyl tube Super lightweight Very compact Wheel Diameter: 29'' Tube Width: 2.20-2.60 Valve Length: 40 mm Valve: Presta Tube Weight: 100 g Shaft Type: Threaded