Inner Tube 100/90-19 (3.25/3.50-19) TR4 Staight Valve Stem - Fits on 3.25/3.50-19 Motorcycle Inner Tube 90/90-19 (100/90-19) TR4 Valve Stem: Straight Stem, Round Shape to fit on rims with a round valve base. Fits on these Tube Type Tires: 3.25/3.50-19, 90/90-19, 100/90-19, 110/80-19 Heavy duty durable valve stem. Unbeatable performance and value.