The Alcatraz was designed from the ground up to be the best dirt jump and slopestyle bike you have ever ridden. Marin worked hand- in-hand with Matt Jones to define the exact needs of a modern dirt jump frame, and are proud to release the complete Alcatraz into the world. The 6061 Series 3 aluminum alloy frame is stiff and overbuilt for abuse, with a tapered headtube and 135x10mm horizontal drop outs. Available solely as a complete bike, so there is less time between you and throwing big whips and flips. Bike is lightly ridden, mechanically In excellent shape, a couple scratches. cross posted.