Inner Tube 3.50/4.00 - 19 TR4 Straight Valve Stem - Fits on 100/90 - 19, 110/80 - 19, 110/90 - 19, 120/80 - 19 Motorcycle Inner Tube 3.50/4.00-19 TR4 Valve Stem* TR4 Valve Stem: Centered, Straight Stem, Round Shape to fit on rims with a round valve base. Fits on these Tube Type Tires: 3.50 - 19, 4.00 - 19, 4.10 - 19, 4.25 - 19, 4.60 - 19 Heavy duty durable valve stem. Unbeatable performance and value.