Ruption newboy 18 bmx bikethe ruption newboy 18 bmx bike is the perfect machine for the younger rider thats getting into bmx for the first time the short 18 top tube and smaller 18 wheels provide a confidence inspiring upright riding position a tubular 3pc crmo crankset with an oversized usa type bottom bracket provides excellent durability features frame ruption 1020 high tensile steel with 18 top tube forks ruption 18 1020 high tensile steel forks handlebars ruption 7 rise bars