San Quentin 20"

San Quentin 20 profile.

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  • Price: $1099*
  • Suspension: SR Suntour XCM 24 BOOST, 80mm Travel, 110mm Axle Spacing
  • Wheel Size : 20"
  • Frame: Aluminum
  • Size Range: One Size

Manufacturer’s suggested retail price may not include additional shipping or preparation charges. Please contact your local Marin dealer for a quote.

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.


  • Frame

    Series 2 6061 Aluminum, 20” Wheels, Disc Specific, 135mm Dropouts

  • Front Suspension

    SR Suntour XCM 24 BOOST, 80mm Travel, 110mm Axle Spacing

  • Rim

    Marin, Double Wall Alloy, 25mm Internal

  • Hub Rear

    Forged Aluminum, 32H, Disc Specific

  • Hub Front

    Forged Aluminum, 32H, Disc Specific

  • Spokes

    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

  • Brakes Front

    Tektro HD-J285 Kid's Specific Hydraulic Disc

  • Brakes 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

Specifications, pricing, and availability are subject to change without notice.


San Quentin 20" geometry diagram
Stack 499
Reach 310
Head Tube Angle 65°
Head Tube Length 90
Seat Tube Angle 75°
Seat Tube Length 308
Top Tube Effective 443.4
BB Height 260
BB Drop 10
Chain Stay 340
Wheel Base 922
Stand Over Height 540
Fork Offset 40
SeatPost Diameter 30.9
Handlebar Width 590
Stem Length 35
Crank Length 140

All lengths in millimeters



San Quentin 24” and 20” both feature a Series 2 aluminum frame, with a tapered headtube, 3D forged dropouts, IS brake mounts, semi-internal cable routing and 135mm open dropouts.

Learn More
Liv and Matt and their San Quentins


Taking cues from the Alcatraz, as well as the full-size San Quentin lineup, the San Quentin 24” and 20” proved all the benefits of DJ style, with massive standover, slick frame tubes, and a hot paint job.

San Quentin 24" headtube


A slack headtube angle paired with a steep seat tube angle creates a ride that will fly uphill, yet descend like it’s on rails. The balanced rider position is puts the rider weight between the wheels for steady climbing and handling on flats, while the slack front end helps to add higher speed stability through turns and rough patches.

San Quentin 24" 1x drivetrain


Modern 1x drivetrains, just like the larger San Quentins, give the rider the benefits of shifting simplicity and chain retention.

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