Ruption hacker bmx bikethe ruption hacker bmx bike is the first 20 model in this brand new ruption range offering outstanding value for money it features fully sealed hubs front and rear 3pc crmo cranks a sealed mid type bottom bracket and 9 handlebars features frame ruption 1020 high tensile steel with 20 5 top tube forks ruption 1020 high tensile steel tapered forks handlebars ruption 9 rise bars 30 wide 10 back sweep 2 up sweep grips flangeless soft grips stem alloy 55m