SET OF TWO: Motorcycle Inner Tube 2.50/2.75-10 | 80/90-10 | 80/100-10 - TR4 Straight Valve Stem SET OF TWO Motorcycle Inner Tube 2.50/2.75-10 TR4 Valve Stem. TR4 Valve Stem: Straight Brass Stem, Round Shape to fit on rims with a round valve base. Fits on 2.50/2.75-10, 3.10-10, 70/100-10, 80/90-10, 80/100-10. Heavy duty durable valve stem. Unbeatable performance and value.