Marin San Quentin 20" Kids Bike - 2026

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MRN740689001
  • SR Suntour XCM Suspension fork
  • Tektro hydraulic disc brakes
  • Shimano 8-speed gears
£899.00
Excl. Tax: £749.17
Stock Status:
In stock

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

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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 (to be done by customer)

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.

V12 Finance Available

Finance Available*.

Learn more

Details

The Marin San Quentin 20 Kids Bike – 2026 is a scaled-down version of Marin’s renowned hardcore hardtail, built to offer young riders real mountain bike performance. With a tough aluminium frame, 80mm suspension fork, wide 2.6” tyres, and kid-specific hydraulic disc brakes, it’s equipped for speed, control, and serious off-road fun.

Key Features and Benefits:

  • Series 2 6061 aluminium frame with 20” wheels: This frame uses the same durable material found in adult hardtails, offering high strength with low weight. This gives young riders a tough yet agile platform for trail riding.
  • SR Suntour XCM 24 BOOST fork with 80mm travel: The front suspension absorbs bumps and rough terrain, improving traction and comfort. The result is a smoother ride with more control and confidence.
  • Tektro HD-J285 hydraulic disc brakes with short-reach levers: Designed specifically for children’s hands, these brakes provide strong and reliable stopping power. This ensures responsive braking in all weather, increasing safety and control.
  • Shimano Altus 8-speed drivetrain with 11-32T cassette: A wide gear range makes it easier to tackle climbs and control speed on descents. This allows kids to adapt to varied terrain without struggle.
  • Wide 20 x 2.6” Vee Tire Crown Gem tyres: These tyres offer extra grip and stability on dirt, gravel, and roots. This gives riders the traction needed to stay upright and in control.
  • Forged alloy crankset with narrow-wide chainring: The chainring design reduces the chance of dropping the chain, while the shorter 140mm crank arms suit smaller legs. This makes pedalling smoother and more efficient.

Built for young riders who want a proper bike, the San Quentin 20 delivers capable trail performance in a size that fits. The tough frame, real suspension, and reliable components provide the control, grip, and confidence kids need to ride harder and progress faster. It’s not a toy – it’s a trail-ready machine.

Give them the right tools to ride with control and confidence on real terrain. The Marin San Quentin 20 is ready for the next step.

Size -Rider height range:

One Size - 3'8" to 4'4"


Specification

BrandMarin Bikes
MPN740689001

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Finance

Our Payment Options

Maestro Mastercard Visa PayPal V12 Retail Finance Clearpay

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, 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, Klarna and Clearpay. Credit is provided subject to affordability, age and status. Minimum spend applies. Use responsibly, T&Cs & late fees apply.

Our Finance Providers

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.