Inner Tube 4.10/4.60-18 TR4 Staight Valve Stem - Fits on 100/90-18 | 100/100-18 Motorcycle Inner Tube 4.10/4.60-18 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: 4.10/4.60-18, 100/90-18, 100/100-18, 110/80-18, 110/90-18, 120/80-18 Heavy duty durable valve stem. Unbeatable performance and value.