Marin Alcatraz Jr - 2025

We've taken the Alcatraz 1 and scaled it down for smaller riders. Built upon the same tubing as the larger models, it features a 360mm reach, 69° headtube angle, and 72° seattube angle, with 369mm chainstays. A suspension-corrected rigid CrMo fork is designed to handle rough-and-rowdy riding, and a simple and stout single-speed drivetrain and Tektro mechanical disc brakes ensure a fun and safe ride.

Specifications

Frame Series 3 6061 Aluminum, 24” Wheels, 135x10mm Horizontal Single Speed Dropouts, 73mm Threaded BB, ISCG 05 Tabs

Fron Suspension Marin Series 2 CroMo 24", Suspension Corrected, 100x9mm Dropouts

Rims 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 3/8" Axle, 100mm Spacing

Spokes 14g Black Stainless Steel

Tires Vee Tire, Rail 24x2.25”, LSG Compound, Wire Bead

Derailleur, Raer -

Shift Lever -

Crankset Marin Forged Alloy, Alloy 32T DM Chainring, 155mm Length

Bottom Bracket External Sealed Cartridge Bearings

Chain KMC HL-1

Cassette 14T Single Speed Cog

Brake, Front Tektro MD-M280 Mechanical Disc 160mm Rotor

Brake, Rear Tektro MD-M280 Mechanical Disc 160mm Rotor

Brake Levers Tektro CL-330TS Alloy

Handlebar Marin Riser, 6061 Double Butted Aluminum, 31.8mm at center bulge, 38mm Rise, 700mm Width, 4º Up, 9º Back

Stem Marin 3D Forged Alloy, 31.8mm clamp, 35mm extension

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