Outlaw Motorcycle Heavy Duty Inner Tube 2.5mm Thick 100/90-19" 110/90-19&rdquo; Rear You are buying one Outlaw Racing Rear Heavy Duty Inner Tube 100-110/90 x 19 Inch (2.5 mm thick). Our super thick inner tube is a blend of natural and butyl rubber Twice as thick as OEM tubes to help resist punctures and pinch flats Designed for motocross, enduro, and woods riding Fits REAR tires with 19 Inch rim - 100/90-19", 110/90 -19", 90/100-19", 3.60/4.10-19"