Marin Alcatraz 24" Kids Bike - 2025

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MRN739060001
  • Series 3 6061 Aluminium Frame
  • Tektro mechanical disc brakes
  • Suspension-corrected rigid CrMo fork
Stock Status:
Stock due soon - order now for despatch in 7 days

Built with care: Our mechanics fully assemble your bike before it's carefully packaged and shipped to you.

At Tweeks Cycles, we ensure your bike arrives fully assembled and, most importantly, well packaged so it arrives with you as it left us.

Upon delivery, simply unpack it, attach any included pedals (believe it or not, some bikes don’t come with pedals!), adjust the handlebars, and you're ready to ride!

It’s all super simple!

BUT! Please take extra care when fitting any pedals that are provided with your bike. Pedals are side specific and MUST be fitted to the correct side of the bike. They are usually clearly labelled Left and Right. Failure to do so will permanently damage the bike, void the bikes warranty and lead to many tantrums, for children or grown children alike!

Comprehensive 14-Point Inspection

Each bike undergoes a meticulous 14-point inspection to guarantee optimal condition and performance:

  • Ensure Cycle is free of any mechanical damage, paint chips or missing parts
  • Grease seat tube, secure seat clamp, make sure the saddle is level and ensure all fixings are secure
  • Ensure handlebar, stem and brake/gear levers are secured
  • Assess headset for play or tightness
  • Ensure handlebar tape or grips are fitted securely
  • Ensure wheel nuts, quick-release levers or through axles are tightened (please note: some adult mountain bikes come with the front wheel removed for transport), true the wheels for optimal alignment and check wheel bearings for proper adjustment
  • Inflate tyres to the correct pressure
  • Ensure front and rear brakes operate correctly. Bleed hydraulic brakes if required
  • Ensure pedal threads are greased
  • Test all gears to ensure smooth operation
  • Check suspension system for correct operation and ensure bolts are tight (if required)
  • Ensure smooth bottom bracket rotation with no free play and secure crank bolts
  • Check cable/house routing and that cable ends are fitted
  • Install reflectors and bell

This thorough process ensures your bike is in peak condition upon arrival. We do not fit mudguards or other accessories prior to shipping as these are likely to be damaged in transit.

Note on Electric Bikes

Due to shipping restrictions, in some circumstances you may receive your new electric bike and its battery separately. This is due to carriage restrictions on some removable batteries.

Note on Balance Bikes

Balance bikes are shipped unassembled, allowing you to enjoy the building experience and retain the original packaging-perfect for gifting.

Details
Built for young riders ready for the next level of control and durability, the Marin Alcatraz 24" delivers unmatched performance. Its lightweight Series 3 Aluminium frame ensures agile handling, while the suspension-corrected CrMo fork is tough enough for any terrain. With precision geometry and robust components, this bike is made for fun and safety.
Key Features and Benefits:
  • Advanced Frame Geometry: Features a 360mm reach, 69° headtube angle, and 72° seat tube angle, creating a balanced and stable ride. This ensures better control and confidence for young riders tackling varied terrains.
  • Suspension-Corrected CrMo Rigid Fork: Built to handle tough trails, the fork absorbs shocks effectively, ensuring smoother rides. This design reduces stress on the rider, promoting comfort and endurance.
  • Single-Speed Drivetrain: A simple, reliable setup minimizes maintenance while providing consistent power transfer. This makes it easier for kids to focus on their ride without worrying about complex gear systems.
  • Tektro Mechanical Disc Brakes: Equipped with 160mm rotors, these brakes deliver strong, reliable stopping power. This ensures better safety and control in all conditions, from wet trails to steep descents.
  • Durable Tyres and Rims: Vee Tire Rail 24x2.25” tyres paired with Marin Custom Extrusion rims provide excellent traction and durability. This results in better grip and confidence on rugged surfaces.

Designed to inspire confidence, the Marin Alcatraz 24" helps young riders push their limits safely and comfortably. Its thoughtfully engineered frame, top-tier braking system, and robust components provide a bike that meets the demands of growing adventurers.

Ready for a bike that combines durability, control, and simplicity? The Marin Alcatraz 24" is your perfect choice for endless fun and reliable performance.

Specification

FrameSeries 3 6061 Aluminum, 24” Wheels, 135x10mm Horizontal Single Speed Dropouts, 73mm Threaded BB, ISCG 05 Tabs
ForkMarin Series 2 CroMo 24", Suspension Corrected, 100x9mm Dropouts
RimsMarin Custom Extrusion, 27mm Inner, Pinned Joint
Hub, RearForged Alloy, 135x10mm, Bolt-On, Quad Sealed Bearings, Disc, 32H
Hub, FrontForged Alloy, Bolt On 3/8" Axle, 100mm Spacing
Spokes14g Black Stainless Steel
TyresVee Tire, Rail 24x2.25”, LSG Compound, Wire Bead
CranksetMarin Forged Alloy, Alloy 32T DM Chainring, 155mm Length
Bottom BracketExternal Sealed Cartridge Bearings
ChainKMC HL-1
Cassette14T Single Speed Cog
Brake, FrontTektro MD-M280 Mechanical Disc 160mm Rotor
Brake, RearTektro MD-M280 Mechanical Disc 160mm Rotor
Brake LeversTektro CL-330TS Alloy
HandlebarMarin Riser, 6061 Double Butted Aluminum, 31.8mm at center bulge, 38mm Rise, 700mm Width, 4º Up, 9º Back
StemMarin 3D Forged Alloy, 31.8mm clamp, 35mm extension
GripsMarin MTN, Closed End
HeadsetFSA No 57E, Semi-Sealed Cartridge Bearings, 1 1/8" x 1 1/2”
SeatpostMarin Alloy, 30.9mm
SaddleMarin DJ Saddle
PedalsAlloy Platform
ExtrasMarin Chain Tension Device

Brand Marin Bikes
MPN 739060001

Customer Reviews
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Finance

Our Payment Options

Maestro Mastercard Visa PayPal V12 Retail Finance

Online we currently accept payment from the methods listed above including a wide range of finance options. In store we also accept payment in the form of cash and gift vouchers.

Finance Options

In order to get the kit you want, when you need it, without ruining the family finances we offer a highly flexible range of finance options to help you get the best products on your bike now rather than at the end of the season when you've saved up the cash to make the purchase. There are even interest free options which effectively spread the cost without costing you any extra.

D.T.(Automotives) Limited T/A Tweeks Cycles is authorised and regulated by the Financial Conduct Authority and is the broker and not the lender. Our FCA registration number is 689896. D.T.(Automotives) Limited offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance and Klarna. Credit is provided subject to affordability, age and status. Minimum spend applies. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority.

Delivery & Returns

UK Mainland Delivery Prices

Delivery Type Cost Estimated Delivery Time
Standard Delivery for orders under £49.99 from £1.33 2-3 working days from day of despatch(Excludes weekends and Bank Holidays)
Standard Delivery for orders over £49.99 Free
Bike Delivery Free 3-5 working days from day of despatch *(Excludes weekends and Bank Holidays)
Express Delivery from £1.68 1-2 working days from day of despatch(Excludes weekends and Bank Holidays)
Special Delivery from £12.54 For any next working day delivery order before 4.30pm Monday to Thursday.
For any weekend delivery order before 4.30pm Friday

* Bike Delivery Info

A bike has to go though a Pre Delivery Inspection (PDI Check) prior to despatch, ensuring the bike is thoroughly checked and set up prior to you receiving. This also means an express delivery service is unavailable. We strive to despatch bikes within 3-5 working days. Please note this may change over school holidays and the festive season (November/December). For more information on the process please visit our pre-build page.

For international shipping please visit our delivery page.

For information about returning an item please visit our returns page.