The Alcatraz family of dirt jump bikes are all based on Marin Series 3 aluminium tube sets, with short chain stays and ambidextrous internal cable routing.  Effectively available in three sizes with the addition of the Alcatraz Jr 24" wheeled bike, specs include a rigid forked bike offering amazing value for money and a Manitou Circus suspension fork equipped bike for a ready-to-roll bike suitable for all sorts of terrain.