BMX Racing tubes with Presta valve (small valve). Valve lenght : 40mm.Weight :18x1": 80g / 2.816 Ounces20x1-1/8": 66g / 2.336 Ounces24x1-1/8": 66g / 2.336 Ounces24x1.5-1.75": 173g / 6.08 Ounces