Inner Tube - Standard - 21" - TR-4 - Center Metal Valve

Features"Real butyl tubes" made from 100% butyl polymer, unlike other "butyl" tubes, which are blended with butyl polymer and natural rubberEach tube is individually boxed with a full range of sizes and valve stem types clearly marked on each box end100% butyl tube minimizes natural air leakage while maintaining air pressure for a longer period of timeSpecs Duty: Standard Inner Tube Valve Stem Type: TR-4 (Round Base) Riding Style: Off-Road Tube Fits Tire Size: 100/80-21 Tube Fits Tire Size: 80/100-21 Tube Fits Tire Size: 90/90-21 Inner Tube Valve Stem Type: Center Metal Valve (Threaded/Nuts) Mounting Position: Front/Rear Product Name: Inner Tube Tube Fits Tire Size: 90/100-21 Units: Each Material: Butyl Polymer Rim Diameter: 21" Tube Fits Tire Size: 2.75-21 Tube Fits Tire Size: 3.00-21 Type: MotorcycleApproximate Package Weight & Dimensions Weight: 1.3 Height: 3 Length: 6.5 Width: 5.5