Duro inner tube for motorcycle Tyres are thick and offer excellent pressure stability. This tube has a straight valve. A correct tyre change always requires a new tube. Tubes may also be used in tubeless tyres as roadside assistance. Suitable for the following tyre options: 3.00-18 3.25-18 3.50-18 90 / 100-18 90 / 90-18 100 / 80-18 100 / 90-18 110 / 70-18 110 / 80-18 110 / 90-18 120 / 70-18 120 / 80-18 120 / 90-18