80 Millimeters

SET OF TWO Motorcycle Inner Tube 2.75/3.00-21 TR4 Valve Stem. TR4 Valve Stem: Straight Stem, Round Shape to fit on rims with a round valve base. Heavy duty durable valve stem. Fits on these Tube Type Tires: 2.75/3.00-21, 80/90-21, 80/100-21, 90/80-21, 90/90-21, 100/80-21.