Inner Tube 2.25/2.50 - 17 TR4 Straight Valve Stem - Fits on 2.25 - 17, 2.50 - 17 Motorcycle Inner Tube 2.25/2.50-17 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: 2.25 - 17, 2.50 - 17 Heavy duty durable valve stem. Unbeatable performance and value.