Specialized Ground Control Youth Tire Description: The Specialized Ground Control Youth Tire was adapted from Specialized's successful tire, The Ground Control, only adapted for all sizes and ages. This tried-and-true design features CAD-engineered knob shapes, which strengthen the knob structure for optimal braking and traction, but it keeps the knob surfaces adaptable for the best possible grip on mountain trails. Features: Tread profile is optimized for the best possible combination of speed and grip Wire bead and 70a compound create a long lasting, durable tire Specifications: Tire Type: Clincher Bead: Wire Compound | Casing: 60a | - TPI (Threads Per Inch): 60 TPI Puncture Protection: - Inflation: - Color: Black Weight: -