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Marin Alcatraz 24 dirt jump bike with aluminium frame, single-speed setup and hydraulic rear disc brake for young riders progressing skills
Marin Alcatraz 24 dirt jump bike with aluminium frame, single-speed setup and hydraulic rear disc brake for young riders progressing skills
Marin

Marin Alcatraz Jr 24 inch wheel Dirt Jump Hardtail Mountain Bike 2026 in Red Pink

£849.00
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We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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In the unlikely event that you are not satisfied with your purchase please feel free to return your items within 90 days of the purchase date for a full exchange or refund. Any item (excluding food, underwear or e-gift vouchers) can be returned to us for any reason within 90 days, provided that the item has not been used or fitted and is returned in its original packaging with valid proof of purchase.

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Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

Marin Alcatraz Jr 24 inch wheel Dirt Jump Hardtail Mountain Bike 2026 in Red Pink

Season:2026

Brand:Marin

Code:741876001

The Alcatraz JR is a purpose-built dirt jump and pump track bike designed for younger riders ready to push their skills to the next level. Inspired by Marin’s full-size Alcatraz range and developed with input from pro rider Matt Jones, it delivers a tough, responsive ride that’s perfect for jumps, tricks and progression.

Built around a strong yet lightweight Series 3 aluminium frame, the Alcatraz features a compact, agile geometry with short chainstays and a low standover height—ideal for manuals, jumps and confident handling. A suspension-corrected Cro-Mo fork keeps things simple and durable, while quality components ensure it’s ready to ride straight out of the box.

A hydraulic rear disc brake provides reliable stopping power and control when you need it most, while the single-speed drivetrain keeps maintenance low and performance high. With wide tyres and a solid wheelset, it’s built to handle everything from pump tracks to skateparks and dirt jumps.

Tough, playful and built for progression, the Alcatraz is the perfect choice for young riders looking to build confidence and style on every ride.

Key Features & Benefits:

  • Built for Progression:Compact geometry and DJ-specific design help young riders develop skills with confidence.
  • Strong Yet Lightweight Frame:Series 3 aluminium construction balances durability and agility.
  • Low Maintenance Simplicity:Single-speed drivetrain keeps things simple and reliable.

Full Specification:

  • Frame: Series 3 6061 aluminium, 24" wheels, 135x10mm horizontal dropouts, threaded BB, ISCG 05 tabs
  • Fork: Marin Series 2 Cro-Mo, suspension corrected
  • Number of Gears: 1
  • Gear Shifters: N/A
  • Rear Derailleur: N/A
  • Chainset: Marin forged alloy
  • Crank Length: 152mm
  • Chainrings: 32T
  • Rear Cassette: 14T single-speed cog
  • Chain: KMC HL-1
  • Bottom Bracket: External sealed cartridge bearings
  • Pedals: Alloy platform
  • Brakes: Tektro HD-M280 hydraulic disc (rear)
  • Brake Rotors: 160mm rear
  • Rims: Marin custom extrusion, 27mm internal
  • Front Hub: Forged alloy, bolt-on, 100mm spacing
  • Rear Hub: Forged alloy, bolt-on, 135x10mm, quad sealed bearings
  • Spokes: 14g black stainless steel
  • Front Tyre: Vee Tire Rail 24x2.25"
  • Rear Tyre: Vee Tire Rail 24x2.25"
  • Handlebars: Marin riser, 6061 aluminium, 30mm rise, 700mm width
  • Handlebar Width: 700mm
  • Handlebar Grips: Marin MTN grips
  • Headset: FSA No.57E, semi-sealed cartridge bearings
  • Stem: Marin forged alloy, 35mm
  • Stem Length: 35mm
  • Saddle: Marin DJ saddle
  • Seatpost: Marin alloy, 30.9mm
  • Extras: Marin chain tension device
  • Weight: Not specified by manufacturer

Manufacturers reserve the right to change specifications without notice based on availability at the point of assembly.

Sizing Chart for Marin Alcatraz

SizeRider height range
OS4'1" - 4'9" (124-145cm)

Geometry Information for Marin Alcatraz

OS
A Stack526
B Reach360
C Headtube angle69°
D Headtube length110
E Seattube length280
F Seattube angle72°
G Toptube effective531
H Bb heightTBD
I Bb drop12
J Chainstay369
K Wheelbase973
L Standover height370
M Fork offset44
N Seatpost diameter30.9
O Handlebar width750
P Stem length35
Q Crank length155



Warranty Information for Marin:

Marin Mountain Bikes, Inc. ("Marin") warrants to the original retail purchaser ("you") that the Marin product for which you received this warranty is free from defects in material and workmanship for the periods below

FRAMES WARRANTY PERIOD (From date of purchase)
Carbon Fiber Frames and Forks: 5 Years
Rigid Frames and Forks: Lifetime
Full Suspension Frames: 5 Years
COMPLETE BICYCLE
The complete bicycle is warranted for one year (from date of purchase), including all original parts on the bicycle except tires, tubes, chains and other wear & tear items. Paint and decals are covered under this warranty.
This warranty does NOT cover suspension forks, and rear shocks on full suspension bikes. These items are covered by the suspension component manufacturer’s warranty. Please contact the suspension component manufacturer for any warranty needs.
For full warranty policy please visit marinbikes.com

Sizing Information
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