Marin Alcatraz 24"The Marin Alcatraz 24" is a purpose built dirt jump bike scaled down for younger or smaller riders who want to follow in the footsteps of freeride legend Matt Jones. Built around a robust Series 3 6061 Aluminum frame, this bike is designed to be incredibly stiff and flickable. It features a suspension corrected Cro Mo steel fork, horizontal dropouts with an integrated chain tensioner, and a dedicated single speed setup. Whether hitting local pump