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The San Quentin 24 and 20 is for the kid looking to explore everything an offroad bike can do from singletrack to park rides to just cruising the neighborhood in style
The San Quentin 24 and 20 is for the kid looking to explore everything an offroad bike can do from singletrack to park rides to just cruising the neighborhood in style
Marin

Marin San Quentin 20 - Black / White

£649.00
Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
No Hassle Returns


Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.



To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.

Additional non-returnable items:

  • Gift cards
  • Custom painted items
  • Items that have had custom decals fitted or frame protection
  • Custom built items such as wheels or bikes
  • Special order items
  • Some health and personal care items

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer.

There are certain situations where only partial refunds are granted: (if applicable)

  • Book with obvious signs of use.
  • CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened.
  • Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
  • Any item that is returned more than 30 days after delivery


Refunds (if applicable)

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds (if applicable)

If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted.

If you’ve done all of this and you still have not received your refund yet, please contact us at info@mechmonkey.co.uk.

Sale items (if applicable)

Only regular priced items may be refunded, unfortunately sale items cannot be refunded.

Exchanges (if applicable)

We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at info@mechmonkey.co.uk and send your item to: 2A Balmoral Link, Belfast, BT12 6QB, United Kingdom.

Gifts

If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.

If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.

Shipping

To return your product, you should mail your product to: 2A Balmoral Link, Belfast, BT12 6QB, United Kingdom.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

Marin San Quentin 20 - Black / White

Season:2025

Brand:Marin

Code:737618001

We took our Matt Jones-inspired Marin San Quentin and shrunk it down to fit 20” wheels. It's the perfect bike for kids who are ready for their first proper, hardcore hardtail mountain bike.

The Marin San Quentin 20”, just like the big kid’s version, shreds the boundaries of the mountain bike genres - doing it all with a huge splash of big air, speed and style.

Designed with the input of freeride legend Matt Jones, the San Quentin takes the DNA of our dirt-jumping Alcatraz and mutates it into a go-further and faster all-round, hardcore hardtail. The San Quentin 20” will feel just like a ‘grown up’ mountain bike to your little ripper, built with a stout Series 2 aluminum frame, 20” wheels, an SR Suntour XCM suspension fork, 8-speed Shimano drivetrain and kid’s specific hydraulic disc brakes.
Technical Information
  • FRAME
    Series 2 6061 Aluminum, 20” Wheels, Disc Specific, 135mm Dropouts
  • FRONT SUSPENSION
    SR Suntour XCM 24 BOOST, 80mm Travel, 110mm Axle Spacing
  • RIMS
    Marin, Double Wall Alloy, 25mm Internal
  • HUB, REAR
    Forged Aluminum, 32H, Disc Specific
  • HUB, FRONT
    Forged Aluminum, 32H, Disc Specific
  • SPOKE, NIPPLES
    14g Stainless Steel
  • TIRES
    Vee Tire Crown Gem, 20x2.6”, Wire Bead
  • DERAILLEUR, REAR
    Shimano Altus
  • DERAILLEUR, FRONT
    -
  • SHIFT LEVER
    Shimano Altus SL-M315, 8-Speed
  • CRANKSET
    Forged Alloy, Narrow Wide 30T, 140mm
  • BOTTOM BRACKET
    Sealed Cartridge Bearings, Square Taper
  • CHAIN
    KMC Z8
  • CASSETTE
    Shimano 8-speed, 11-32T
  • BRAKE, FRONT
    Tektro HD-J285 Kid's Specific Hydraulic Disc
  • BRAKE, REAR
    Tektro HD-J285 Kid's Specific Hydraulic Disc
  • BRAKE LEVERS
    Tektro Kid's Specific Short Reach Lever for Hydraulic Brake
  • HANDLEBAR
    Marin Riser, 31.8 clamp, 30mm Rise, 590mm Width
  • STEM
    Marin Alloy, 35mm
  • GRIPS
    Marin MTB
  • HEADSET
    1-1/8" x 1-1/8" FSA No 10P
  • SEATPOST
    Marin Alloy, 30.9mm
  • SADDLE
    Marin Kids MTB
  • PEDALS
    Kids Specific Nylon Pedal
Sizing Information

ONE SIZE
Stack499
Reach310
Head Tube Angle65°
Head Tube Length90
Seat Tube Angle75°
Seat Tube Length308
Top Tube Effective443.4
BB Height260
BB Drop10
Chain Stay340
Wheel Base922
Stand Over Height540
Fork Offset40
SeatPost Diameter30.9
Handlebar Width590
Stem Length35
Crank Length140

All lengths in millimeters


Size Guide
: 110 - 130cm
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