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Heavy duty 21'' Motorcycle Innertube 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 Suitable for on-road or off-road use Comes complete with double seam welded straight Schrader valve and cap Valve Type: /Schrader (Car Type)/Inner Diameter: /450 mm / 17.72 inches/Outer Diameter: /690 mm / 27.17 inches/Inner Tube Size: /90/90-21/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