Alcatraz Jr 24 2026

A serious dirt-jump bike for the next generation of shredders

Built to ride hard and progress fast, the Marin Alcatraz 24” is a purpose-built dirt jump and pump track bike designed for riders who want strength, control and confidence straight out of the box. Equipped with a powerful Tektro hydraulic rear disc brake, you get reliable stopping power and enhanced control for jumps, berms and technical lines.

At the heart of the Alcatraz is Marin’s Series 3 6061 aluminium frame — lightweight, durable and engineered to handle big hits and rough landings. The frame features short chainstays for responsive handling and easy manuals, while the low, compact geometry keeps the bike agile and manoeuvrable. It’s designed to help you level up your riding, whether you’re hitting dirt jumps, pump tracks or skateparks.

Scaled specifically for smaller riders, the 24-inch wheel platform delivers the perfect balance of stability and playfulness. It’s also race-ready for the Cruiser Class, making it a great choice for BMX riders looking to transition to a larger wheel setup.

Key Features - 

• Series 3 6061 Aluminium Frame – Lightweight, strong and jump-ready

• Tektro Hydraulic Rear Disc Brake – Consistent, powerful braking control

• 24” Wheels – Ideal for dirt jumps, pump tracks and BMX Cruiser racing

• Internal Cable Routing – Clean looks and reduced cable rattle

• 73mm BSA Bottom Bracket – Easy servicing and long-term durability

• Horizontal Dropouts with Chain Tensioners – Dialled chain setup and secure rear wheel positioning

• ISCG 05 Tabs – Ready for chain guides for aggressive riding

SPECIFICATION - 

• Fork - Marin Series 2 Cro-Mo 24" Fork, Suspension Corrected, 100x9mm Drop Outs
• Frame - Series 3 6061 Aluminium, 24” Wheels, 135x10mm Horizontal Dropouts, 73mm Threaded BB, ISCG 05 Tabs
• Rim - Marin Custom Extrusion, 27mm Inner, Pinned Joint
• Hub Rear - Forged Alloy, 135x10mm, Bolt-On, Quad Sealed Bearings, Disc, 32H
• Hub Front - Forged Alloy, Bolt On 3/8t" Axle, 100mm Spacing
• Spokes - 14g Black Stainless Steel
• Tires - Vee Tire, Rail 24x2.25”, LSG Compound, Wire Bead
• Crankset - Marin Forged Alloy, Alloy 32T DM Chainring, 152mm Crank Length
• Bottom Bracket - External Sealed Cartridge Bearings
• Chain - KMC HL-1
• Cassette - 14T Single Speed Cog
• Brakes Rear - Tektro HD-M280, Hydraulic Disc, 160mm Rotor
• Brake Levers - Tektro HD-M280
• Handlebar - Marin Riser, 6061 Double Butted Aluminium, 30mm Rise, 700mm Width, 4º Up, 9º Back
• Stem - Marin 3D Forged Alloy, 35mm
• Grips - Marin MTN, Closed End
• Headset - FSA No 57E, Semi-Sealed Cartridge Bearings, 1 1/8" x 1 1/2”
• Seatpost - Marin Alloy, 30.9mm
• Saddle - Marin DJ Saddle
• Pedals - Alloy Platform
• Extras - Marin Chain Tension Device