SET OF TWO: Motorcycle Inner Tube 2.75/3.00-21 | 80/90-21 | 80/100-21 - TR4 Straight Valve Stem SET OF TWO Motorcycle Inner Tube 2.75/3.00-21 TR4 Valve Stem TR4 Valve Stem: Straight Stem, Round Shape to fit on rims with a round valve base. Fits on these Tube Type Tires: 2.75/3.00-21, 80/90-21, 80/100-21, 90/80-21, 90/90-21, 100/80-21 Heavy duty durable valve stem. Unbeatable performance and value.