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Heavy Duty Construction: 21'' Motorcycle Innertube designed for durability and reliable performance Universal Fitment: This fits the following sizes which may not be written on the Innertube itself 2.75-21 or 275-21 or 3.00-21 or 300-21 or 2.75/3.00-21 or 90/90-21 or 80/100-21 or 90/100-21 or 3.25-21 Versatile Application: Suitable for on-road or off-road use Quality Valve System: Comes complete with double seam welded straight Schrader valve and cap Detailed Specifications: Valve Type: Schrader (Car Type), Inner Diameter: 450 mm / 17.72 inches, Outer Diameter: 690 mm / 27.17 inches, Inner Tube Size: 2.75 / 3.00 - 21, Valve Angle Type: Straight, Wheel Rim Size: 21 Inch, Valve Overall Length: 27 mm / 1.06 inches, Valve Outer Thread Diameter: 7.56 mm / 0.3 inches, Valve Inner Diameter: 5.5 mm / 0.22 inches, Valve Thread Length: 16.9 mm / 0.67 inches