Inner Tube 120/90-17 TR4 Straight Valve Stem - fits on Front 4.25/4.50 or Rear 4.50/4.75 Motorcycle Inner Tube 120/90-17 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: 4.00/4.50-17, 110/90-17, 110/100-17, 120/80-17, 120/90-17, 130/80-17, 130/70-17 Heavy duty durable valve stem. Unbeatable performance and value.