Marin Bikes | Alcatraz Jr.

📏Size Guide

The Marin Bikes Alcatraz Jr is a dirt jump bike built for younger riders who are ready to launch, spin, and rip like the pros. Inspired by the same DJ geometry as the full-sized Alcatraz — co-designed with freeride legend Matt Jones — the Jr version brings all the same style and shred potential to a 24” platform.

Perfect for pump tracks, dirt jumps, and skateparks, the Alcatraz Jr 24 is low, tight, and built to boost confidence and air time.

Key Features:

• Series 2 Aluminum Frame
Dirt jump geometry scaled for youth, with a short chainstay and low standover height

• Rigid Steel DJ Fork
Lightweight, bombproof fork for pumping and launching without weight penalties

• 24” Wheels
Sized perfectly for younger riders while maintaining agility and control

• Single-Speed Drivetrain
Simple, tough, and low-maintenance — ideal for dirt jump and park sessions

• Mechanical Disc Brakes
Reliable braking with big stopping power for confident progression

• Wide DJ-Style Bars & Short Stem
Responsive cockpit that mirrors pro setups in a youth-friendly size

• Big Volume Tires
Plenty of cushion and grip for hard landings and dusty berms