Inner Tube 4.00/4.25 - 19 TR4 Straight Valve Stem - Fits on 4.00 - 19, 4.25 - 19, 110/90 - 19 Motorcycle Inner Tube 4.00/4.25-19 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: 4.00 - 19, 4.25 - 19, 110/90 - 19 Heavy duty durable valve stem. Unbeatable performance and value.